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Caligula

Gaius Julius Caesar Augustus Germanicus (31 August AD 12 – 24 January AD 41), commonly known as Caligula from the diminutive Latin term for his childhood military boots, was the third Roman emperor of the Julio-Claudian dynasty, reigning from AD 37 until his assassination in AD 41.^[1]^[2] Born in Antium to the popular general Germanicus and Agrippina the Elder, he spent part of his youth in the military camps of the Rhine legions, earning his nickname among the troops.^[1] Succeeding the reclusive Tiberius amid widespread anticipation, Caligula's early rule featured restorative policies such as abolishing treason trials, distributing bonuses to the Praetorian Guard and populace, and initiating public works, fostering initial acclaim.^[3] However, his administration soon shifted toward autocratic centralization, fiscal profligacy—including lavish spectacles and architectural projects that strained the treasury—and political purges targeting perceived rivals, culminating in his murder by Praetorian officers.^[3]^[4] The ancient sources—primarily Suetonius, Cassius Dio, and to a lesser extent Philo of Alexandria and Seneca—provide the bulk of surviving accounts, yet these were composed decades or centuries later by authors with senatorial biases against imperial excess, often amplifying anecdotes of megalomania, sadism, and divine pretensions to underscore moral lessons or justify subsequent regimes.^[5]^[4] Empirical evidence from inscriptions, coins, and contemporary letters suggests a ruler who consolidated power amid genuine threats, such as early conspiracies, but whose unchecked authority enabled arbitrary executions and economic mismanagement without the counterbalance of republican institutions.^[3] Modern analyses, drawing on archaeological data like the rapid depletion of Tiberius's surpluses for aqueduct repairs and harbor expansions, portray Caligula not as incurably mad but as a young autocrat whose policies reflected the inherent instabilities of the principate's transition from disguised republic to overt monarchy.^[4]^[2]

Early Life and Family Background

Birth and Ancestry

Gaius Julius Caesar, later known as Caligula, was born on 31 August 12 AD in Antium (modern Anzio), a resort town in Latium, Italy.^[6]^[1]^[7] This date is corroborated by the ancient biographer Suetonius, who notes the birth occurred the day before the Kalends of September during the consulship of his father Germanicus and Gaius Fonteius Capito.^[7] He was the third of six children born to Germanicus Caesar (born 24 or 15 BC, died 19 AD), a prominent Roman general and adopted son of Emperor Tiberius, and Agrippina the Elder (born c. 14 BC, died 33 AD), a noblewoman from the Julian gens.^[1] Caligula's ancestry intertwined the Julian and Claudian lineages, forming the core of the Julio-Claudian dynasty that ruled Rome from Augustus to Nero. Through his mother Agrippina the Elder, daughter of Marcus Vipsanius Agrippa (Augustus's longtime general and son-in-law) and Julia the Elder (Augustus's only child), he was a direct great-grandson of Emperor Augustus, linking him to the Julian gens descended from the legendary Aeneas and Venus.^[1]^[8] On his father's side, Germanicus was the eldest son of Drusus the Elder (Tiberius's younger brother and a Claudian) and Antonia Minor (daughter of Mark Antony and Octavia, Augustus's sister), thus incorporating Claudian prestige and traces of the Antonine line from the Second Triumvirate era.^[1] This dual heritage positioned Caligula as a prime candidate for imperial succession, embodying both Augustan legitimacy and military Claudian tradition from birth.^[8]

Childhood and Family Tragedies

Gaius Julius Caesar Augustus Germanicus, known as Caligula, experienced profound family losses beginning in his early childhood. His father, Germanicus, a prominent Roman general and adopted son of Tiberius, fell ill in Antioch and died on 10 October AD 19 at age 33.^[9] Ancient historians such as Tacitus and Suetonius reported suspicions of poisoning, with accusations directed at Gnaeus Calpurnius Piso, the governor of Syria, who was later tried for the murder though acquitted of direct involvement.^[7] Contemporary analyses suggest possible natural causes like disease, potentially exacerbated by contemporary medical treatments, rather than foul play orchestrated by Tiberius, whose rivalry with Germanicus fueled persistent rumors.^[10] These events, occurring when Caligula was seven years old, marked the onset of systematic persecution against his family. Following Germanicus's death, Caligula's mother, Agrippina the Elder—granddaughter of Augustus—was accused of treason amid intrigues involving Lucius Aelius Sejanus, prefect of the Praetorian Guard. In AD 29 or 30, she was exiled to the island of Pandateria (modern Ventotene), where she refused food and died by starvation in AD 33 at around age 44.^[11] Her elder brother Nero Julius Caesar, designated as Tiberius's heir alongside Drusus the Younger, faced similar charges of conspiracy; exiled to Ponza in AD 31, he perished there shortly after, likely from starvation or suicide induced by despair.^[7] Caligula's younger brother, Drusus Caesar, imprisoned in AD 30 on fabricated treason counts, endured a prolonged ordeal and died of starvation in AD 33, reportedly gnawing at his mattress stuffing in desperation.^[12] These tragedies, attributed by ancient sources to Sejanus's machinations to eliminate rivals and secure power under Tiberius, decimated the Julio-Claudian line, leaving Caligula as the sole surviving son.^[13] Orphaned and isolated, he resided under the protection of his grandmother Antonia Minor until summoned to Capri by Tiberius around AD 31, navigating a precarious existence amid ongoing suspicions of familial disloyalty. The deaths, while documented in biased accounts from historians critical of Tiberius, reflect documented patterns of imperial purges rather than unsubstantiated personal vendettas, though direct evidence of Tiberius's complicity remains circumstantial.^[7]

Exposure to Military and Capri Sojourn

![Reconstruction of Villa Jovis, Tiberius's principal residence on Capri][float-right]
Gaius Julius Caesar, born on 31 August AD 12, accompanied his father Germanicus to the Rhine frontier shortly after the death of Augustus on 19 August AD 14, when he was less than two years old. Germanicus, appointed commander of the upper German legions, confronted mutinies sparked by demands for better pay and conditions following the emperor's passing; Gaius's presence among the troops reportedly contributed to calming the unrest. The soldiers bestowed upon him the nickname Caligula, derived from caligae, the heavy hobnailed sandals of the legionary infantry, as he wore a miniature version in camp.^[7] This early exposure continued through Germanicus's punitive expeditions into Germania in AD 15 and 16, aimed at avenging the Roman defeat at the Teutoburg Forest in AD 9 and recovering lost standards. Gaius, aged approximately three to four, traveled with the family amid the army's operations across the Rhine, immersing him in the rigors of frontier warfare and legionary life from a tender age. Such experiences cultivated familiarity with the military, evident later in his initial rapport with the troops upon becoming emperor.^[14] Germanicus's sudden death in Antioch on 10 October AD 19 orphaned Gaius at seven, prompting his return to Rome under the tutelage first of his great-grandmother Livia, then his grandmother Antonia Minor, amid escalating suspicions against the Julio-Claudian family. The subsequent exile and deaths of his mother Agrippina the Elder and brothers Nero Caesar and Drusus Caesar under Tiberius's orders heightened the precarity of his position. In AD 31, after the purge and execution of Praetorian Prefect Lucius Aelius Sejanus—whose rivalry had targeted Germanicus's heirs—Tiberius summoned the 18-year-old Gaius to his secluded villa on Capri, where the emperor had withdrawn from Rome since AD 26 or 27. Gaius assumed the toga virilis upon arrival, signifying adulthood, and remained on the island until Tiberius's death on 16 March AD 37, spanning roughly six years. During this period, he served as a close attendant, observing imperial governance from afar while suppressing personal resentments toward his great-uncle. Primary accounts, such as Suetonius's biography written decades later under emperors antagonistic to Caligula's memory, allege Tiberius deliberately exposed him to tortures, executions, and debaucheries to corrupt or "soften" his nature, portraying Gaius as a dissimulating "viper" in private; however, these narratives, echoed in hostile sources like Cassius Dio, prioritize moral invective over verifiable detail and reflect senatorial biases post-assassination rather than impartial history.^[7]^[15]

Ascension and Early Reign

Tiberius's Death and Imperial Succession

Tiberius died on 16 March AD 37 at his villa in Misenum, after falling ill en route from Astura, where he had experienced abdominal pain and exposure to cold drafts, leading to a decline despite temporary recovery.^[16] Ancient accounts differ on the precise cause, with some attributing it to natural illness from advanced age (77 years) and prior health issues, while others allege foul play, including slow poisoning by Caligula, deliberate starvation during convalescence, or smothering with a pillow after Tiberius briefly revived from an apparent fainting fit and demanded his signet ring.^[16] These suspicions, reported by Suetonius, reflect the hostile tone of later historians toward Caligula but remain unverified, as no contemporary evidence confirms murder, and Tiberius's documented intemperate habits and isolation on Capri could plausibly contribute to a natural demise.^[16] The Praetorian Prefect Naevius Sutorius Macro, who had succeeded Sejanus and cultivated ties with Caligula (including through promises to Macro's wife Ennia), played a pivotal role in the transition, reportedly hastening to Misenum upon Tiberius's collapse and supporting Caligula's claim amid the emperor's final moments.^[7] Tiberius's will, read before the Senate, designated Caligula (then aged 24) and his grandson Tiberius Gemellus (aged 17 or 18) as principal co-heirs with equal shares of the estate, alongside bequests to the Praetorians, populace, and Vestal Virgins.^[16] However, Macro and elements of the Senate and populace, citing public sentiment against Gemellus's lineage from Drusus, disregarded the joint provisions, annulling Gemellus's co-heir status and acclaiming Caligula as sole princeps on 18 March AD 37.^[7]^[17] Caligula, as Germanicus's son and Tiberius's grandnephew (adopted in AD 31 alongside Gemellus), benefited from his father's popularity and Tiberius's lack of direct surviving male heirs, positioning him as the Julio-Claudian successor despite Gemellus's blood proximity.^[7] Initially, Caligula adopted Gemellus and granted him honors, but the Senate's acclamation secured Caligula's unchallenged authority, with the Praetorian Guard's loyalty—bolstered by Macro—ensuring military backing against potential rivals.^[18] This rapid consolidation reflected the principate's reliance on senatorial ratification and praetorian enforcement rather than strict testamentary adherence, a pattern established under Augustus.^[7] Caligula's entry into Rome on 28 March was met with jubilation, as crowds viewed him as a restorative figure after Tiberius's reclusive rule.^[19]

Initial Popularity and Restorative Policies

Upon acceding to the throne on 18 March AD 37 following Tiberius's death, Caligula was received with immense enthusiasm by the Roman populace and provincials, who viewed him as the fulfillment of high expectations tied to his father Germanicus's legacy.^[7] Crowds along his route from Misenum to Rome erected altars, offered sacrifices, and hailed him with affectionate nicknames such as "star," "chick," and "nursling," reflecting broad public affection.^[7] The Senate unanimously conferred full imperial powers upon him, overriding elements of Tiberius's will that had named his grandson Gemellus as co-heir, signaling elite consensus on his legitimacy.^[7] To consolidate support, Caligula implemented restorative measures reversing Tiberius's repressive policies. He distributed a donative of 1,000 sesterces to each Praetorian Guardsman and 300 sesterces to every Roman citizen, fulfilling promises that secured military and popular loyalty.^[7] He recalled all exiles banished under Tiberius, including political figures and performers, thereby alleviating grievances from prior purges.^[7] Additionally, he publicly burned the records of treason trials associated with his mother Agrippina and brothers, vowing not to consult them, and abolished such proceedings outright, rejecting further informant submissions to end the climate of fear.^[7] These actions, enacted in the first months of his rule, fostered an atmosphere of relief and optimism, with Suetonius noting over 160,000 animal victims sacrificed in public rites during the initial three months as part of celebratory extravagance.^[7] Caligula also hosted lavish banquets for senators and equestrians, further endearing him to the elite.^[7] This early phase marked a deliberate contrast to Tiberius's isolation and severity, positioning Caligula as a restorer of Augustan-era liberality.^[7]

Administrative and Financial Policies

Fiscal Reforms and Treasury Management

Upon his accession in AD 37, Caligula inherited a substantial treasury surplus accumulated by Tiberius, variously reported as 2.3 billion, 2.7 billion, or 3.3 billion sesterces, sufficient to cover a full year's pay for the empire's approximately 3,000,000 troops.^[20]^[7]^[21] He promptly distributed lavish donatives to secure loyalty, including 1,000 sesterces per Praetorian Guardsman—doubling Tiberius's prior gratuity of 500 sesterces—500 sesterces to members of the urban cohorts, and 300 sesterces to legionaries.^[20] To the Roman populace, he released Tiberius's bequest of 45 million sesterces alongside an additional 240 sesterces per recipient plus 60 sesterces in interest.^[20] These outlays, combined with expenditures on spectacles, actors, gladiators, and court luxuries, depleted the reserves within roughly one to two years.^[20]^[7] Early fiscal leniency included the abolition of a one percent sales tax in Rome, which alleviated burdens on merchants and consumers, and the public disclosure of treasury accounts—contrasting Tiberius's opacity—to foster transparency.^[20] Caligula also enrolled additional wealthy individuals into the equestrian order, potentially expanding the taxable base.^[20] However, such measures proved insufficient against ongoing extravagance, prompting a shift to coercive revenue generation.^[21] To refill the treasury, Caligula intensified confiscations, prosecuting elites on charges of treason, conspiracy, or malfeasance to seize estates and assets, particularly from senators, equestrians, and centurions.^[20]^[21] He auctioned confiscated items—including gladiatorial equipment, horses, and imperial properties—at inflated prices and fined provincial officials such as highway commissioners for alleged corruption.^[20] In Gaul, his administration executed local nobility to appropriate their wealth, while in Italy, he established a personal cult requiring wealthy recruits as priests, extracting fees under religious pretexts.^[21] These practices temporarily restored funds but eroded elite support, as detailed in accounts by Cassius Dio and Suetonius, whose senatorial perspectives likely amplified portrayals of fiscal rapacity amid broader hostility to Caligula's centralizing tendencies.^[20]^[7]

Taxation and Economic Measures

Caligula acceded to the throne inheriting a vast treasury amassed by Tiberius, with ancient sources citing figures ranging from 2.3 billion to 2.7 billion sesterces.^[21] His early reign featured measures to gain popular favor, including the abolition of certain unpopular taxes such as aspects of the sales tax, though these were soon overshadowed by fiscal pressures from extravagant expenditures on palaces, games, and military projects.^[22] By late 39 or early 40 AD, the treasury was reportedly exhausted, prompting a shift to aggressive revenue generation.^[21] To fund his regime, Caligula introduced numerous novel taxes, as detailed by Suetonius, who records levies "new and unheard of" initially collected by publicans and later by praetorian centurions and tribunes due to the contractors' excessive profits.^[23] Specific impositions included a fixed tax on all foodstuffs brought into the city, a 2.5 percent charge on the value of lawsuits and legal transactions (known as the quadragesima litium), and taxes on auctions.^[24] Cassius Dio corroborates and expands on these, noting additional burdens such as taxes on taverns, craftsmen, the earnings of wage slaves, prostitutes, and even a levy proportional to the number of slaves owned by citizens.^[25] A marriage tax targeting dowries and bride prices further monetized social customs.^[22] These measures proved insufficient, leading to extralegal tactics including the fabrication of treason charges against wealthy senators and equestrians to seize their estates and assets, a practice ancient historians like Suetonius and Dio attribute directly to Caligula's rapacity.^[26] Suetonius describes how he sold off imperial property, including gladiators' equipment and previously confiscated goods, at inflated prices via auctions presided over by himself.^[23] Such policies, while temporarily bolstering funds, eroded elite support and fueled perceptions of tyranny, as evidenced by the consistency across hostile sources like Suetonius and Dio, who, despite their senatorial biases, align on the causal link between unchecked spending and fiscal desperation.^[22] No evidence supports widespread currency debasement under Caligula; his coinage, including aurei and denarii, maintained standard purity, distinguishing his measures from later emperors' inflationary expedients.^[27]

Public Works and Infrastructure

Construction Projects in Rome

Caligula completed several public works in Rome that had been initiated but left unfinished under Tiberius, including the Temple of Augustus on the Palatine Hill and restorations to the Theatre of Pompey in the Campus Martius. These efforts addressed longstanding infrastructural needs, with the temple's dedication fulfilling a decree from Augustus's funeral in 14 AD and enhancing the city's religious landscape.^[7]^[3] In 38 AD, Caligula began construction on two major aqueducts to augment Rome's water supply, which had strained under population growth: the Aqua Claudia, spanning approximately 69 kilometers from springs near Lago di Fucino, and the Aqua Anio Novus, drawing from the Anio River and extending about 87 kilometers. Both projects involved extensive engineering, including elevated arcades entering Rome from the east, and were designed to deliver high-quality water to public fountains, baths, and private properties, nearly doubling the city's capacity upon completion under Claudius in 52 AD.^[7]^[28]^[29] Caligula also initiated an amphitheater adjacent to the Saepta Julia in the Campus Martius for gladiatorial games, though it was abandoned after his assassination in 41 AD. Additionally, he extended the Palatine imperial palace eastward to the Roman Forum, incorporating the Temple of Castor and Pollux as its vestibule and constructing an elevated bridge across the Temple of the Deified Augustus to connect it directly to the Capitoline Hill, facilitating personal access but altering sacred precincts. These works reflect a focus on imperial connectivity and spectacle, funded amid fiscal strains from earlier extravagances.^[7]

Extravagant Engineering Feats

Caligula ordered the construction of a temporary pontoon bridge across the Bay of Baiae in 39 CE, spanning approximately 3.6 kilometers (2.2 miles) from Baiae to Puteoli.^[30] The structure consisted of merchant vessels and war galleys lashed together side by side, topped with earthen fill and wooden planking to form a stable roadway wide enough for chariots.^[22] According to Suetonius, Caligula crossed it on horseback while wearing a breastplate attributed to Alexander the Great, followed by a procession that included soldiers and civilians, spending two days feasting and reveling on the bridge to demonstrate mastery over the sea and fulfill a prophecy that he had no more chance of becoming emperor than of crossing the bay on horseback.^[31] Cassius Dio corroborates the event, noting its immense cost amid growing financial pressures, with the bridge dismantled shortly after.^[30] Another notable feat involved the creation of two enormous pleasure barges on Lake Nemi, commissioned during Caligula's reign around 39–41 CE, measuring roughly 71 meters and 68 meters in length respectively.^[32] These vessels featured advanced engineering, including lead-sheathed hulls, multiple bronze anchors, hand-operated bilge pumps resembling modern chain pumps, and onboard plumbing systems with hot and cold water supplied via pipes.^[33] Decorated with marble columns, ivory, gold leaf, and mosaic floors, they served as floating platforms for ceremonies honoring deities like Isis and Diana, showcasing hydraulic and architectural sophistication beyond typical Roman vessels of the era.^[34] The ships sank in the lake post-reign but were recovered in the 1930s, revealing their opulence before destruction by fire in 1945; ancient historians like Suetonius allude to such extravagant maritime projects tied to Caligula's excesses, though primary accounts emphasize their scale over precise technical details.^[35] These projects, while demonstrating Roman engineering prowess in pontoon construction and naval luxury, strained imperial finances and fueled contemporary criticisms of megalomania, as reported in senatorial sources like Suetonius and Dio, which, though biased against Caligula, align on the feats' occurrence and extravagance.^[22] No remnants of the Baiae bridge survive, but the Nemi ships' recovered artifacts confirm the era's capacity for such innovations, distinct from more utilitarian infrastructure like aqueducts.^[32]

Military Engagements and Provincial Affairs

German Campaigns and Frontier Security

In 39 AD, following the alleged discovery of a senatorial conspiracy, Caligula left Rome for Lugdunum (modern Lyon) in Gaul before advancing to the Rhine frontier, where he sought to emulate his father Germanicus's campaigns against the Germanic tribes and secure the loyalty of the legions stationed there.^[36] He summoned auxiliary units and regular legions from multiple provinces, enforced strict recruitment quotas, and stockpiled military provisions, including grain and weaponry, to support an offensive posture.^[36] This mobilization addressed lingering tensions from earlier mutinies under Tiberius and aimed to project imperial strength amid reports of Germanic raiding activity across the Rhine.^[37] Caligula crossed the Rhine with his forces, engaging in direct confrontations with tribes such as the Chauci, whom he reportedly subdued through decisive action, compelling their leaders to surrender and provide hostages.^[36] Primary accounts, including Suetonius, describe hand-to-hand fighting that resulted in Roman casualties, followed by a withdrawal after constructing and then demolishing a pontoon bridge, which the emperor justified as a precaution against treachery akin to the Teutoburg Forest ambush of 9 AD.^[7] Cassius Dio, drawing on earlier traditions, alleges more eccentric orders, such as soldiers gathering seashells from the North Sea coast as "spoils of Neptune," an episode interpreted by later historians either as satirical exaggeration by hostile sources or as a ritualistic or propagandistic act tied to frontier engineering preparations.^[38] These operations, though limited in scope and yielding no permanent territorial expansion beyond the Rhine, contributed to frontier security by deterring coordinated Germanic incursions and reaffirming Roman dominance through punitive raids and the visible presence of imperial forces.^[37] Archaeological evidence from legionary camps like those at Vetera (Xanten) indicates sustained logistical support during this period, with no recorded major breaches of the Rhine limes under Caligula's oversight.^[39] Upon returning to Gaul for the winter of 39–40 AD, he rewarded veteran troops with donatives and discharges, fostering discipline and reducing internal dissent, though ancient biographers like Suetonius—writing over 60 years later under a regime critical of Julio-Claudian excess—portray the expedition as more theatrical than substantive, potentially downplaying its stabilizing effects to emphasize the emperor's instability.^[7]^[1]

British Expedition and Naval Preparations

In late 39 or early 40 AD, following his campaigns along the Rhine frontier, Caligula traveled to Gaul and initiated extensive military preparations aimed at an expedition across the English Channel toward Britain.^[40] He assembled legions and auxiliary forces from across the empire, conducting rigorous levies and reviews to bolster troop numbers and discipline.^[7] These efforts included constructing a pontoon bridge over the Rhine River to demonstrate engineering prowess and logistical capability, echoing Julius Caesar's earlier crossings.^[41] A key component involved massive naval construction at ports like Gesoriacum (modern Boulogne-sur-Mer), where Caligula ordered the building of approximately 1,000 ships of diverse designs, including fast liburnian galleys, larger vessels with two banks of oars, and even some equipped with protective covers, ballistae, and multiple rowing decks for troop transport and combat.^[7] ^[42] This fleet expansion, involving requisitioned merchant vessels and purpose-built warships, reflected an intent to project Roman power across the Channel, potentially to subdue British tribes or secure tribute, as partial Roman influence already existed through trade and diplomacy.^[40] By mid-40 AD, Caligula led the assembled forces—estimated at several legions strong—to the Channel coast, where he reportedly issued orders for the invasion to commence.^[7] However, the campaign abruptly halted short of a full crossing; instead, troops were commanded to collect seashells from the beach, piling them into helmets and camp chests as "spoils of victory from the Ocean," accompanied by a declaration of war against the sea god Neptune.^[7] ^[38] Ancient historians Suetonius and Cassius Dio, writing under later emperors hostile to Caligula's memory, framed this as evidence of megalomania or insanity, but archaeological and logistical evidence of the preparations suggests a genuine strategic push aborted due to factors like poor weather, troop reluctance, supply shortages, or intelligence on British resistance.^[40] ^[41] The episode may also have served propagandistic purposes, emulating Caesar's Gallic Wars while avoiding risks that could undermine imperial prestige.^[42] These events laid preliminary groundwork later exploited by Claudius, who launched a successful invasion in 43 AD using similar staging areas and vessels.^[43] The preparations strained resources but demonstrated Caligula's focus on expanding Roman frontiers, though biased senatorial sources emphasize ridicule over potential rationales like deterrence of Germanic threats or consolidation of Gaul.^[40]

Eastern Policies and Mauretania Annexation

Caligula maintained the diplomatic equilibrium in the East established under Tiberius, confirming the favorable settlement between Parthian king Artabanus III and the Roman governor of Syria, Publius Vitellius, which had resolved tensions over Armenia and ensured Parthian recognition of Roman influence without direct confrontation.^[44] This approach prioritized stability along the Euphrates frontier, avoiding the costly wars pursued by predecessors like Augustus and successors like Nero, though Caligula engaged in assertive correspondence with Artabanus, demanding symbolic gestures of submission such as prostration before Roman envoys to affirm imperial prestige.^[45] No major military expeditions materialized during his reign, with troop concentrations in Syria likely serving as a deterrent rather than preparation for invasion, reflecting a policy of armed diplomacy that preserved resources amid domestic priorities.^[46] In Armenia, the buffer kingdom between Roman Syria and Parthian domains, Caligula oversaw continuity after the death of Artaxias III in AD 35, allowing the installation of pro-Roman rulers amid Parthian internal strife under Artabanus, whose temporary deposition in AD 39 by a rebel faction further weakened eastern threats without prompting Roman intervention.^[47] This restraint contrasted with later Julio-Claudian escalations, as Caligula focused on client state management, such as granting eastern territories to allies like Herod Agrippa I, who received the tetrarchy of Philip and additional domains in AD 37–39, bolstering Roman proxies near Parthian borders.^[48] Shifting to North Africa, Caligula's policies culminated in the annexation of Mauretania following the execution of its client king, Ptolemy, in AD 40. Ptolemy, grandson of Cleopatra VII and Mark Antony through his daughter Selene II, had ruled the prosperous kingdom since AD 23, contributing to Roman security and tribute.^[49] Summoned to Rome ostensibly for games or consultations, Ptolemy was accused of conspiracy or ostentatious display—Suetonius attributes his death to the envy aroused by his splendid purple cloak (abolla) drawing public acclaim—leading to his imprisonment and execution by order of Caligula in early AD 40.^[50] Alternative accounts, including Dio Cassius, cite plotting against the emperor, though motives likely intertwined fiscal greed, given Mauretania's wealth from trade and resources, with Caligula reportedly coveting the kingdom's riches.^[51] The annexation promptly divided Mauretania into two provinces—Mauretania Tingitana (centered on Tangier) and Mauretania Caesariensis (around Caesarea)—administered directly by Roman legates and procurators to integrate revenues into the imperial treasury and secure the Atlantic and Saharan frontiers against Berber unrest.^[52] This move ended the client monarchy, previously stable under Juba II and Ptolemy, but provoked rebellion led by Ptolemy's freedman Aedemon, exploiting local loyalties and economic disruptions, which persisted into Claudius's reign before suppression.^[53] The action exemplified Caligula's centralizing tendencies, prioritizing direct control over peripheral wealth despite risks of instability, as evidenced by the immediate provincial reorganization.^[51]

Judicial and Political Relations

Treason Trials and Senatorial Conflicts

Caligula initially fostered goodwill with the Senate upon his accession in AD 37 by abolishing the maiestas (treason) trials instituted under Tiberius, publicly burning the accumulated documents, and recalling political exiles, many of whom were senators.^[7] This policy reversal addressed widespread resentment toward Tiberius's repressive use of treason accusations to eliminate rivals and seize assets.^[54] By AD 39, however, Caligula reinstated treason trials, reviewing Tiberius's records to identify senators who had participated as informers or accusers against his family during earlier prosecutions, denouncing them collectively as untrustworthy.^[55] He accused the Senate en masse of complicity with Sejanus, the disgraced prefect under Tiberius, and fabricated evidence to support charges, leading to numerous convictions determined by senatorial votes under duress.^[55] These proceedings, often conducted without full hearings, resulted in executions of several consular-rank senators and confiscation of their estates to replenish the imperial treasury depleted by earlier largesses and projects.^[56] Specific conflicts escalated through public humiliations and direct confrontations; Caligula compelled senators to run alongside his chariot for miles, dressed in togas, and to attend him at banquets in servile roles, such as holding napkins.^[57] In one instance, he incited the populace to assault and dismember a senator in the Forum after a denunciation, with the remains dragged through the streets.^[58] He also deposed consuls for minor oversights, such as failing to proclaim his birthday, leaving Rome without chief magistrates for three days, and flogged a quaestor suspected of conspiracy after stripping him publicly.^[57] Ancient accounts, primarily from Suetonius and Cassius Dio—written decades later by authors aligned with subsequent emperors—emphasize these events as evidence of tyranny, potentially exaggerating for rhetorical effect to contrast with Flavian-era stability, though the revival of trials aligns with Caligula's need for funds and suspicions of disloyalty amid rumored plots.^[7] The trials targeted perceived threats among the elite, yielding revenues but eroding senatorial autonomy and fostering resentment that fueled conspiracies by AD 41.^[59]

Centralization of Power and Elite Purges

Upon acceding to the throne on 16 March AD 37, Caligula rapidly centralized authority by invalidating the will of Tiberius, which had proposed shared rule with his grandnephew Tiberius Gemellus, thereby establishing sole imperial control backed by the Praetorian Guard under prefect Quintus Sutorius Macro.^[1] He publicly incinerated Tiberius's archives, which contained records of senatorial disloyalty and treason proceedings, effectively shielding many elites from past scrutiny while underscoring his dominance over institutional memory.^[1] This move, combined with assuming triumphal titles such as "Pater of the Armies" and "Greatest and Best of Caesars," shifted the Principate toward overt monarchy, diminishing the Senate's advisory role.^[7] Caligula further eroded senatorial autonomy through personal assertions of divinity and loyalty demands, ordering the replacement of divine statues' heads with his likeness and constructing a temple to his own cult complete with appointed priests.^[7] He compelled oaths of allegiance extending to his sisters alongside himself and his children, punishing refusals—such as failure to swear by his Genius—with execution or exile.^[7] Interactions with senators turned humiliating; he forced them to run alongside his chariot for miles or serve menially at banquets, and deposed consuls for overlooking his birthday, leaving Rome without chief magistrates for three days.^[7] Such acts, reported by Suetonius, reflect a deliberate undermining of republican pretenses inherited from Augustus, prioritizing imperial whim over collegial governance. Elite purges commenced early in the reign, targeting perceived threats to consolidate loyalty. In AD 37, Caligula ordered the execution of Gemellus on charges of treason, administering poison after accusing him of withholding an antidote during the emperor's illness.^[1] Marcus Junius Silanus, his father-in-law and a consular, was driven to suicide by razor amid allegations of disloyalty.^[7] Macro, instrumental in Caligula's rise, faced forced suicide in AD 38 following the emperor's recovery from a severe fever, as his influence waned amid suspicions of conspiracy.^[1] Tensions peaked in AD 39 with the revival of maiestas (treason) trials, echoing Tiberius's repressive era but intensified for fiscal gain through asset confiscations.^[60] A conspiracy uncovered in September led to the executions of consul Gnaeus Lentulus Gaetulicus and Marcus Aemilius Lepidus, the latter linked romantically to Caligula's sisters Agrippina and Livilla, prompting their exile.^[1] Dio Cassius and Suetonius record dozens of senators and over 20 equestrians condemned in subsequent proceedings, often on fabricated villainy charges, with Caligula personally reviewing and destroying prior treason records to implicate survivors.^[7] These purges, while drawing from hostile sources written decades later, align on the scale and motive, serving both security and treasury replenishment after extravagant expenditures.^[1]

Religious Policies and Imperial Cult

Promotion of Personal Divinity

Caligula elevated his status to that of a living god during his reign from AD 37 to 41, demanding divine honors that exceeded those granted to previous emperors.^[7]^[20] Initially, upon ascending the throne, he forbade the erection of his images, but soon reversed this policy, ordering temples and sacrifices to himself as a deity.^[20] This shift aligned with eastern practices, including the introduction of proskynesis, a ritual prostration reserved for gods and monarchs, which he imposed on senators and courtiers.^[61] He constructed a temple dedicated to his own numen (divine essence) on the Palatine Hill, appointing priests to officiate and requiring sacrifices of exotic animals such as flamingos and peacocks.^[7] A colossal golden statue of himself, redressed daily in contemporary attire, was installed within this temple for veneration.^[7] Cassius Dio reports two temples in Rome and a sacred precinct at Miletus, where he styled himself Jupiter Latiaris, with priesthoods assigned even to his wife Milonia Caesonia and his horse Incitatus.^[20] Archaeological excavations in the Roman Forum have uncovered evidence of Caligula incorporating an existing temple into his palace complex around AD 40, supporting literary accounts of his self-integration with sacred spaces.^[62]^[63] Caligula frequently equated himself with major deities, declaring Jupiter his equal and adopting divine attributes such as Jupiter's robe, scepter, and thunderbolts.^[7]^[20] He positioned himself for worship between the statues of Castor and Pollux on the Capitoline, conversed with Jupiter in thunderstorms, and threatened to displace the god from his temple.^[7] Statues of Greek gods, including the Olympian Jupiter, were altered to bear his likeness, blurring distinctions between imperial and divine iconography.^[7] These acts, chronicled by Suetonius and Dio Cassius—historians writing decades later under emperors who upheld the senatorial damnation of Caligula's memory—reflect a deliberate escalation of the imperial cult beyond posthumous deification to living worship, though their hostile tone may amplify details for propagandistic effect.^[7]^[20] The Senate, compelled to acclaim him as a god, endured humiliations such as running beside his chariot in togas to demonstrate obeisance.^[7] Caligula's claims extended to impersonating multiple deities—Jupiter, Neptune, Hercules, and others—while asserting superhuman feats like celestial unions.^[20] This promotion of personal divinity intensified senatorial resentment, contributing to his assassination in AD 41, after which his cult was suppressed.^[20]

Relations with Judaism and Provincial Religions

Caligula's relations with Judaism were marked by initial favoritism toward certain Jewish elites followed by escalating conflict over religious observance. Upon ascending the throne in AD 37, he granted the Jewish client king Herod Agrippa authority over territories formerly held by Philip the Tetrarch, including Batanea, Trachonitis, and Auranitis, and later expanded this in AD 39 by adding Abilene, reflecting a pragmatic alliance rather than ideological sympathy.^[1] However, Caligula's insistence on divine honors clashed with Jewish monotheism, culminating in his order in late AD 40 to erect a colossal statue of himself, depicted as Jupiter, in the Temple of Jerusalem's sanctuary. This directive, conveyed through the legate Petronius to Syria, aimed to integrate the imperial cult into Jewish worship but provoked widespread Jewish resistance, including mass protests and work stoppages by peasants in Galilee who blocked transport of materials.^[64]^[65] The Jerusalem statue crisis, documented primarily by Jewish authors Philo of Alexandria and Flavius Josephus, nearly incited a full-scale revolt, as Petronius delayed enforcement amid fears of bloodshed and economic disruption to grain supplies from Egypt. Philo, leading a delegation to Rome in AD 39-40, appealed directly to Caligula, who dismissed Jewish objections by equating refusal with treason, though accounts from these sources emphasize Caligula's megalomania and anti-Jewish prejudice influenced by courtiers like the Alexandrian Greek Helicon.^[66]^[67] Historians corroborate the event's occurrence through Roman sources like Dio Cassius, noting Caligula's broader demands for deification, but Jewish narratives may amplify hostility due to communal trauma from prior pogroms in Alexandria. The order was rescinded only after Caligula's assassination in January AD 41, averting immediate catastrophe, though it underscored Judaism's exemption from emperor worship under prior Augustan precedents, which Caligula sought to override.^[68] Regarding provincial religions, Caligula deviated from the tolerant syncretism of Augustus and Tiberius by aggressively promoting his personal divinity across the empire, requiring oaths and sacrifices to himself as a living god, which disrupted local cults resistant to such impositions. In Egypt, he mandated statues of himself in synagogues alongside temples, mirroring the Jerusalem edict and straining relations with diaspora Jews while enforcing the imperial cult in Hellenized provinces.^[69] In Gaul and other western provinces, reports of coerced participation in his worship fueled senatorial grievances, though evidence of outright suppression of indigenous deities like those in druidic or Celtic traditions is sparse, suggesting enforcement focused on elite compliance rather than wholesale eradication.^[70] This policy reflected Caligula's view of provincial religions as subordinate to his autocracy, yet practical limits—such as military logistics and fiscal needs—prevented uniform imposition, preserving de facto tolerance where imperial loyalty was assured without divine concessions. Primary accounts from Suetonius and Dio highlight these demands as symptomatic of his rule's centralizing absolutism, corroborated by numismatic evidence of deified portraiture on coins from eastern mints.^[1]

Personal Life and Conduct

Marriages, Family, and Succession Issues

Caligula, born Gaius Julius Caesar Germanicus on 31 August 12 AD, was the third son and fourth child of Germanicus, a prominent Roman general and adopted son of Emperor Tiberius, and Agrippina the Elder, granddaughter of Augustus through her mother Julia.^[7] Germanicus's early death in 19 AD, amid suspicions of poisoning, and the subsequent exile and deaths of Agrippina and their elder sons Nero Caesar (died 31 AD) and Drusus Caesar (died 33 AD) under Tiberius's regime decimated the family, positioning Caligula as a surviving male heir in the Julio-Claudian line.^[7] He had three sisters—Agrippina the Younger, Julia Drusilla, and Julia Livilla—who played roles in his court; ancient biographer Suetonius, writing under the Flavian dynasty hostile to Julio-Claudians, alleged habitual incest with them, particularly favoring Drusilla, though such claims reflect senatorial animosity toward imperial autocracy rather than corroborated evidence.^[7] Caligula's first marriage, prior to his accession, was to Junia Claudilla (also called Junia Silana), daughter of consul Marcus Junius Silanus, around 33 AD; she died in childbirth along with the infant.^[7] After becoming emperor in 37 AD, he married three more times in rapid succession: first Lollia Paulina, whom he divorced shortly after and forbade from remarrying; then Livia Orestilla, abducted and wed on her original wedding day to another man before quick divorce and exile; and finally, in late 39 AD, Milonia Caesonia, a woman already pregnant by him, whom Suetonius describes as neither beautiful nor young but passionately loved by Caligula.^[7] These unions produced no surviving sons; Caesonia bore a daughter, Julia Drusilla, in 39 AD, shortly after their marriage, but the child was killed during Caligula's assassination on 24 January 41 AD by having her head dashed against a wall.^[7] Succession remained unresolved due to the absence of a viable male heir, exacerbating tensions in Caligula's regime. Tiberius had named Caligula and his grandson Tiberius Gemellus as co-heirs, but Caligula forced Gemellus to suicide in 37 or 38 AD on pretext of treason.^[7] During a severe illness in October 37 AD, Caligula reportedly designated his sisters as heirs, with Drusilla paramount; her death in June 38 AD prompted excessive mourning and the deification of her alone among Julio-Claudian women, while he briefly elevated her widower-turned-consul Marcus Aemilius Lepidus as potential successor before executing him in 39 AD for alleged conspiracy with Agrippina and Livilla.^[7] These purges eliminated rivals but left no designated successor, contributing to the power vacuum after his murder; the Praetorian Guard promptly acclaimed his uncle Claudius as emperor, bypassing senatorial debate over restoring the Republic.^[7] Suetonius and other post-assassination sources, shaped by elite resentment, portray these acts as tyrannical caprice, yet the pattern underscores dynastic insecurity in the Julio-Claudian succession.^[7]

Alleged Eccentricities and Moral Scandals

Suetonius alleged that Caligula engaged in incestuous relations with all three of his sisters, but especially Drusilla, whom he treated as a wife by parading her openly at banquets and including her portrait on coins during his consulship in AD 37.^[7] Cassius Dio corroborated rumors of familial impropriety, claiming Caligula prostituted his sisters and engaged in sexual acts with them to assert dominance, though both authors wrote decades after Caligula's death (Suetonius around AD 121, Dio in the early 3rd century) under emperors who benefited from discrediting Julio-Claudians.^[5] These claims lack contemporary corroboration and align with senatorial propaganda patterns post-assassination, as no inscriptions or neutral records from AD 37–41 substantiate them.^[71] Caligula's reputed cruelty included sadistic spectacles, such as forcing noblewomen to submit to him during dinners in the presence of their husbands, whom he then ridiculed, and ordering executions for trivial offenses like poor acting performances.^[7] Suetonius detailed instances of torture, like dressing victims in rags before burning them alive or feeding criminals to wild beasts for amusement, while Dio described arbitrary purges where Caligula demanded senators' suicides under threat of worse fates.^[72] Such accounts, however, derive from elite sources hostile to imperial absolutism; archaeological evidence, including surviving administrative records, shows no disproportionate execution rates compared to Tiberius or Claudius, suggesting possible exaggeration to portray Caligula as uniquely tyrannical.^[73] Eccentric behaviors attributed to Caligula encompassed lavish favoritism toward his horse Incitatus, which Suetonius claimed received a marble stable, ivory manger, purple blankets, and servants to serve it barley mixed with gold flakes, with plans to appoint it consul as a satirical jab at senatorial incompetence—though no such appointment occurred before his death in AD 41.^[7]^[74] Dio and Suetonius also reported Caligula's adoption of bizarre attire, such as dressing as Jupiter or a charioteer, and futile "wars" like ordering soldiers to collect seashells from the English Channel as spoils from Neptune in AD 40.^[75] These anecdotes, while vivid, reflect the rhetorical style of ancient biographies aimed at moral edification rather than verbatim history, with Suetonius drawing from rumor and hearsay rather than eyewitnesses.^[76] No physical evidence, such as altered senatorial fasti for Incitatus, supports the consulship claim, indicating it may represent a distorted elite jest rather than literal intent.^[77]

Health, Illness, and Behavioral Shifts

Pre-Reign Illnesses and Recovery

Gaius Julius Caesar Augustus Germanicus, later known as Caligula, reportedly suffered from epilepsy during his childhood. According to Suetonius, he was afflicted with the "falling sickness"—the ancient term for epilepsy—while accompanying his father Germanicus on military campaigns along the Rhine frontier around 14–17 CE.^[7] This condition manifested in recurrent falling fits, a detail consistent with epileptic seizures observed in historical medical descriptions.^[2] Suetonius, drawing from court gossip and anecdotal reports circulated after Caligula's death, presents this as an early indicator of physical vulnerability, though the biographer's account reflects the biases of senatorial sources hostile to the Julio-Claudian dynasty, potentially amplifying infirmities to underscore later "madness."^[7] In his youth, Gaius experienced episodes of sudden faintness that temporarily impaired his ability to walk, stand, maintain posture, or focus his thoughts, as further detailed by Suetonius.^[7] These symptoms align with interictal manifestations of epilepsy or related neurological disturbances, though no contemporary diagnoses exist beyond retrospective interpretations. No explicit records of treatment or full remission appear in surviving sources, but Gaius demonstrated sufficient recovery or management to endure the rigors of military service under Tiberius from 31 CE onward and navigate the intrigues at Capri without documented incapacitation. Cassius Dio, another key ancient historian, omits specific pre-accession illnesses, focusing instead on behavioral traits observed later, which underscores the selective nature of anecdotal evidence in Roman historiography.^[78] Modern analyses suggest possible childhood-onset epilepsy, potentially triggered by febrile seizures, but emphasize that claims of chronic debilitation lack corroboration beyond Suetonius and may serve narrative purposes rather than empirical certainty.^[2]

Reign-Time Health Speculations

Caligula experienced a grave illness in October 37 CE, approximately seven months into his reign, marked by high fever, delirium, and cognitive disorientation as described in ancient testimonies.^[79] Upon recovery, observers including Philo Judaeus reported a profound alteration in his personality, shifting from initial benevolence to heightened paranoia, megalomania, and erratic decision-making, such as demanding worship as a god and executing perceived rivals without due process.^[80]^[79] Contemporary medical hypotheses link this transformation to neurological sequelae from the illness itself. One prominent theory suggests status epilepticus—a prolonged seizure state—occurred during the 37 CE episode, compounding Caligula's documented childhood epilepsy (termed "falling sickness" by Suetonius) and precipitating epileptic psychosis, characterized by paranoia, grandiosity, and impulsivity.^[2]^[81] This view posits that repeated seizures damaged frontal lobe functions, impairing impulse control and fostering antisocial behaviors observed in his later policies, such as arbitrary treason trials.^[2] Chronic lead poisoning represents another causal candidate, stemming from elite Roman practices like consuming defrutum or sapa—wine reduced in leaden vessels to concentrate sweetness, yielding lead acetate levels up to 100-200 mg/L in some analyses.^[82] Caligula's heavy wine intake, noted by ancient biographers, could have elevated blood lead concentrations sufficiently to induce encephalopathy, manifesting in irritability, cognitive deficits, and aggression—symptoms aligning with reports of his insomnia, emaciation, and tyrannical outbursts from 38-41 CE.^[84]^[79] Roman skeletal remains from the era confirm widespread plumbism, with elite exposure 10-100 times modern thresholds, supporting plausibility though not specificity to Caligula absent direct toxicological evidence.^[82] Alternative speculations invoke hyperthyroidism, citing symptoms like persistent wakefulness, hyperactivity, and weight loss potentially exacerbated by the 37 CE fever, or viral encephalitis triggering post-infectious behavioral syndrome.^[85] These remain conjectural, as no autopsy or biomarkers exist, and retrospective diagnosis risks anachronism.^[72] Ancient narratives, penned by Suetonius and Dio Cassius decades later under Flavian or Severan patronage hostile to Julio-Claudians, may amplify pathologies to rationalize regicide, blending verifiable acts (e.g., 20-30 senatorial executions in 39-40 CE) with unconfirmed extravagances.^[3] Thus, while illness likely contributed to intensified autocracy, distinguishing organic causation from power's corrosive effects or propagandistic distortion requires caution.^[86]

Assassination and Immediate Aftermath

Praetorian Plot and Execution

The conspiracy against Caligula formed among officers of the Praetorian Guard, including tribune Cassius Chaerea and fellow tribune Cornelius Sabinus, alongside some senators aggrieved by the emperor's policies and personal insults.^[7] Chaerea, a veteran soldier, harbored particular resentment after Caligula repeatedly mocked his high-pitched voice and physical mannerisms, assigning him humiliating passwords such as "Venus" or terms evoking effeminacy during guard duty.^[87] The plot gained traction amid broader discontent with Caligula's erratic rule, though ancient accounts like Suetonius, written decades later under emperors who condemned Caligula's memory, emphasize personal vendettas over systemic grievances.^[7] On January 24, 41 CE—the ninth day before the Kalends of February—during the Palatine Games dedicated to the Divine Augustus, the assassins executed their plan at midday as Caligula left the theater via a narrow, covered passageway (cryptoporticus).^[7] Chaerea approached first, striking Caligula in the neck with his sword; Sabinus followed, wounding his chest or jaw.^[7] Other conspirators joined, inflicting over thirty stab wounds in total, targeting his genitals among other areas; Caligula attempted to defend himself and flee but cried out that he still lived before collapsing and dying from blood loss.^[7]^[88] Immediately after, Praetorian loyalists and German bodyguards retaliated against some attackers, while Caligula's wife Caesonia was slain in the imperial residence alongside their infant daughter Julia Drusilla, who suffered a brutal death by being dashed against a wall. The assassination's success hinged on the Guard's internal divisions, with plotters exploiting a moment of reduced protection post-games.^[89]

Succession to Claudius and Damnatio Memoriae

Following the assassination of Caligula on January 24, 41 AD, Praetorian Guardsmen discovered his paternal uncle, Tiberius Claudius Nero Germanicus, hiding behind a curtain in the imperial palace on the Palatine Hill.^[90] The guards, seeking a swift resolution amid chaos, proclaimed Claudius emperor on the spot and escorted him to their camp, where they pledged loyalty in exchange for a donative of 15,000 sesterces per soldier—double the amount Caligula had promised earlier.^[91] This military endorsement effectively bypassed senatorial authority, as the Praetorians controlled access to Rome and possessed superior force. The Roman Senate, upon learning of Caligula's death, initially convened in the Temple of Jupiter on the Capitoline Hill and debated abolishing the principate altogether in favor of restoring the Republic, while proposing rewards for the assassins led by tribune Cornelius Chaerea.^[92] Senators expressed jubilation at the tyrant's removal, with some advocating the destruction of Caligula's family records to prevent any Julio-Claudian resurgence.^[93] However, confronted by the Praetorians' armed support for Claudius—a surviving member of the imperial house and brother to the popular Germanicus—the Senate relented and formally ratified his accession on January 25, 41 AD, granting him the titles Caesar Augustus Germanicus.^[91] Claudius, previously marginalized due to physical disabilities, thus secured power through military backing rather than senatorial consensus, marking a precedent for Praetorian influence in imperial successions. In the immediate aftermath, the Senate decreed a damnatio memoriae against Caligula, condemning his memory through measures such as the demolition of statues, erasure of his name from inscriptions, and recall of coins bearing his image.^[94] This sanction, the first applied to a Roman emperor, reflected widespread senatorial animus toward Caligula's perceived abuses, including financial exactions and personal insults to elites.^[95] Claudius, however, intervened to halt full implementation, citing familial ties—Caligula was his nephew—and political prudence to avoid alienating surviving supporters or destabilizing the dynasty.^[96] Partial enforcement occurred nonetheless, evidenced by archaeological finds of mutilated busts and recarved portraits transforming Caligula's features into those of Claudius or neutral figures, as well as defaced coinage from mints like those in Lugdunum.^[95]^[97] These actions preserved some record of Caligula's reign while signaling regime change, though incomplete erasure allowed later historians like Suetonius and Dio Cassius to document his rule extensively.

Historiography and Legacy

Biases in Ancient Sources

The principal ancient sources on Caligula's reign—Suetonius' Lives of the Caesars, Cassius Dio's Roman History, and Seneca's writings—exhibit pronounced senatorial bias, stemming from Caligula's adversarial relationship with the Roman Senate.^[93]^[5] These authors, affiliated with or drawing from senatorial traditions, portray Caligula as tyrannical and megalomaniacal, amplifying anecdotes of cruelty and eccentricity that aligned with post-assassination narratives justifying his removal. Suetonius, writing around 121 CE under Trajan and Hadrian, incorporates sensational details from earlier hostile memoirs, often without critical scrutiny, reflecting the equestrian and senatorial disdain for an emperor who executed or exiled numerous senators and demanded obsequious loyalty.^[5]^[3] Cassius Dio, composing in the early 3rd century CE, similarly emphasizes Caligula's dictatorial paranoia but tempers it less with outright fabrication than Suetonius, though his senatorial perspective colors interpretations of fiscal policies and military decisions as irrational rather than pragmatic responses to conspiracies.^[3] Seneca's accounts introduce personal animus, as Caligula banished him in 41 CE on suspicion of adultery with Julia Livilla, motivating exaggerated depictions of moral depravity in works like On Anger.^[93] None of these sources are contemporary; Suetonius and Dio relied on second- or third-hand reports from the Claudian era, when damnatio memoriae erased pro-Caligula records, fostering a one-sided tradition that prioritized senatorial grievances over administrative achievements, such as public works or grain distributions.^[5] This bias manifests in inconsistencies, such as conflicting reports on Caligula's military campaigns or personal conduct, where verifiable events like the bridge across the Bay of Baiae are reframed as symptoms of insanity rather than symbolic assertions of power.^[3] Contrasting perspectives from Philo of Alexandria and Flavius Josephus, both near-contemporaries with indirect access to court events, offer less uniformly damning views, attributing Caligula's flaws to hubris or youthful excess rather than inherent monstrosity.^[5] Philo's On the Embassy to Gaius (c. 40 CE) critiques Caligula's proposed statue in the Jerusalem Temple as an act of divine pretension but acknowledges early administrative competence and restraint toward provincial elites.^[67] Josephus, in Jewish Antiquities (c. 94 CE), echoes senatorial critiques on extravagance but notes public popularity and famine relief efforts, suggesting the hostile sources overlooked evidence of effective governance to emphasize elite persecution.^[93] These Jewish-authored works, motivated by communal interests rather than senatorial vendettas, highlight how class and ideological alignments distorted the historical record, with no surviving pro-imperial sources to balance the narrative due to the regime's swift collapse.^[5]

Modern Reassessments and Sanity Debates

Modern historians have increasingly challenged the ancient portrayal of Caligula as clinically insane, attributing much of the "madness" narrative to the biases of surviving sources written by senatorial elites hostile to his autocratic rule.^[98] These accounts, primarily from Suetonius and Cassius Dio, emphasize erratic and tyrannical behavior to delegitimize his regime, but lack contemporaneous evidence and often conflate political ruthlessness with psychopathology.^[80] Scholars argue that Caligula's actions, such as demanding recognition as a living god or appointing his horse Incitatus to a mock consulship, served to mock senatorial pretensions and assert imperial supremacy rather than indicate delusion.^[99] Aloys Winterling, in his 2003 analysis, posits that Caligula was not mad but a rational, if inexperienced, ruler navigating the tensions between the imperial court and the senate by escalating monarchical displays to curb aristocratic influence.^[98] Winterling contends that tales of grotesque crimes, like feeding the arena with criminals or engaging in incest, are likely exaggerations or inventions, as they align with rhetorical tropes used against tyrants in Roman literature, unsupported by archaeological or epigraphic records.^[98] He emphasizes contextual factors, including Caligula's youth upon accession in AD 37 and the need to consolidate power after Tiberius's opaque succession, as drivers of his policies rather than mental instability.^[99] Debates persist over potential medical contributors to Caligula's behavior, with some scholars linking reported symptoms—such as visions, insomnia, and sudden rages—to epilepsy documented in ancient texts from his childhood.^[81] A 2021 neuropsychiatric review suggests he may have suffered status epilepticus during his near-fatal illness in late AD 37, possibly triggering interictal dysphoric disorder or temporal lobe dysfunction, which could manifest as megalomania or impulsivity without rendering him incapable of governance.^[81] Recent analyses of Roman medical texts indicate Caligula prescribed hellebore, a treatment for epilepsy and associated mental disturbances, reflecting personal familiarity rather than mere eccentricity.^[100] However, these hypotheses remain speculative, as no direct clinical evidence exists, and alternative explanations like lead poisoning or encephalitis lack corroboration beyond anecdotal reports.^[80] Overall, while Caligula's reign featured verifiable extravagance and terror—evidenced by coinage reforms and provincial building projects alongside purges of perceived threats—modern consensus leans toward viewing him as a competent but despotic emperor whose "insanity" was a post-assassination construct to justify his removal.^[98] This reassessment highlights the risks of retroactively applying modern psychiatric labels to ancient figures, prioritizing political causality over unprovable pathology.^[99]

Archaeological Evidence and Verifiable Facts

Numismatic evidence provides the most direct archaeological attestation of Caligula's reign and iconography. Roman imperial coins minted under Caligula (AD 37–41) bear his portrait, typically laureate or bare-headed, with inscriptions such as C CAESAR AVG GERMANICVS or GAIVS CAESAR AVG GERM P M TR POT, confirming his adoption of imperial titles including Germanicus inherited from his father, Pontifex Maximus, Tribunicia Potestas, and Princeps Senatus.^[101] These aurei, denarii, and sestertii were produced at the Rome mint, with types emphasizing familial piety, such as reverse designs depicting his mother Agrippina the Elder enthroned with a cornucopia or his three sisters Agrippina, Drusilla, and Livilla standing together, reflecting his policy of honoring Julio-Claudian lineage amid prior purges.^[102] Sestertii distributed as largesse often featured Germanicus or Augustus, underscoring continuity with predecessors rather than radical innovation.^[103] Epigraphic evidence corroborates Caligula's administrative and honorific activities. Inscriptions from AD 37, such as one from Saint-Maurice-en-Valais referencing Gaius Caesar Augustus Germanicus, align with his pre-accession recognition and provincial outreach.^[104] Dedications and building records, including partial restorations to the Temple of Jupiter Optimus Maximus on the Capitoline, initiated by Caligula but completed later, appear in fragmentary senatorial decrees and altar inscriptions tying him to traditional Roman piety.^[105] Architectural remains offer tangible proof of Caligula's infrastructural initiatives. Excavations in Rome's Piazza Pia uncovered a first-century AD terraced garden along the Tiber, featuring travertine walls and horticultural layouts consistent with imperial horti, attributed to Caligula based on stratigraphic dating to his reign (AD 37–41) and proximity to known properties like the Horti Agrippinae.^[106] Earlier digs beneath modern structures revealed similar horti remains with imported marbles and artifacts from AD 37–41, including coins and jewelry.^[107] Caligula advanced the Aqua Claudia aqueduct, originally started under Tiberius, with sections bearing his name in lead pipes and inscriptions, evidencing fiscal commitment to water supply despite short tenure.^[108] On Lake Nemi, two massive pleasure barges, excavated in the 1930s, measured up to 73 meters long with lead-keeled hulls, marble pavements, and bronze fittings, matching literary descriptions of Caligula's extravagant vessels sunk post-reign. These artifacts collectively verify Caligula's rule as marked by standard imperial minting, familial propaganda, and public works, with no physical evidence supporting extraordinary excesses beyond scalable luxury in gardens and ships. Provincial bronzes from Caesarea and other mints further attest outreach, bearing his titles without conquest motifs, aligning with a reign focused on consolidation over expansion.^[109]

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The Aqua Claudia was one of the two aqueducts, other being the Aqua Anio Novus, that were begun by Emperor Caligula (reigned 37–41 CE) in 38 CE and finished by ...Overview · Brief History · Route · Notable Surviving Sections
[30]
Roman Emperor Caligula and the Floating Bridge of Baiae
Caligula's demand for the construction of a floating bridge across the Bay of Baiae so that he could ride triumphantly across it.
[31]
A Costumed Caligula Spent Days Enjoying A Bridge Across The Bay ...
Nov 10, 2018 · According to Suetonius (c. 70-130+), Caligula spent the first day trotting back and forth across the bridge on a decorated horse, while wearing ...<|separator|>
[32]
Nemi Ships: How Caligula's Floating Pleasure Palaces Were Found ...
Nov 7, 2018 · Discover the Lake Nemi shipwreck, home to Caligula's opulent pleasure barges, and the ancient treasures unearthed beneath its waters.
[33]
Roman Emperor Caligula and His Legendary Lake Nemi Ships
The Nemi ships confirmed that the lead bars were anchor stocks. Both of Caligula's Nemi ships contained several hand operated bilge pumps working like modern ...
[34]
Museum of the Roman Ships | Nemi - Visit Castelli Romani
During the period of Caligula the two ships were used for lavish ceremonies in honour of the Egyptian goddess Isis and the Latin goddess Diana. They had ...
[35]
The Truth Behind Caligula's Nemi Ships - Alexander Meddings
Caligula's Nemi Ships were destroyed by fire in 1944. But they live on conceptually as vessels for the emperor's debauchery and excess.
[36]
Caligula on campaign in Germany - Irene Soldatos
Caligula had only a single taste of warfare, and even that was unpremeditated. At Bevagna, where he went to visit the river Clitumnus and its sacred grove.
[37]
Military Matters - Roman History 31 BC
Gaul was closer and Germany had been the scene of his father's triumphs. He could expect a warm welcome from his father's legionaries. The campaign is ...
[38]
https://www.historyskills.com/classroom/ancient-history/caligula-attacks-the-sea/
[39]
Germania Inferior (4) - Livius.org
Oct 11, 2020 · All his ancestors had fought against the Germanic tribes, and Caligula must have felt a moral obligation to launch a northern expedition too. In ...
[40]
CALIGULA AND THE SEA-SHELLS - The Roman Army School
May 11, 2020 · She postulated that the river Rhine would have been the main supply route for an invasion of Britain and that the most likely purpose of the ...
[41]
Did the Emperor Caligula plan to invade Britain? - Academia.edu
Amongst the many curious episodes from the emperor Caligula's short reign, one of the strangest must be his parading of the Rhine legions on the Dutch coast ...
[42]
Caligula & the 2nd Invasion of Britain (40AD)
Caligula (after the 'little military boots' that he had worn as a child) is thought to have staged a mock invasion of Britain.Missing: evidence | Show results with:evidence
[43]
The Roman Invasion of Britain | English Heritage
We have little historical evidence for the rest of this campaign. However, Suetonius, writing around AD 120, recorded a prominent role played by one of ...
[44]
Outside Rome | The Emperor Caligula in the Ancient Sources
Apr 20, 2023 · At the outset of his reign he confirmed the settlement, apparently favourable to Rome, reached between the Parthian king Artabanus and the Roman ...
[45]
[PDF] The Romano-Parthian Cold War: Julio-Claudian Foreign Policy in ...
... Parthia, Armenia, and a possible retaliatory expedition to the East during ... Ancient History Vol. IX. Cambridge University Press. Tarn, W. W. 1932b ...
[46]
(PDF) Armed diplomacy: Rome and Parthia in the first century AD
Rome's relationship with Parthia is usually seen as an uneasy stand-off, in which the Romans, smarting from their defeat at Carrhae, inflicted repeated ...
[47]
[PDF] Romano-Parthian relations, 70 BC-AD 220 - LSU Scholarly Repository
influenced Roman policy concerning its eastern boundary. Interference ... Trajan,” Cambridge Ancient History 11 (1936): 241-42 and Debevoise History ...
[48]
The Emperor Caligula in the Ancient Sources 2022948820 ...
... Parthia over the disputed kingdom of Armenia (see Chapter 7). ... “The Three Daughters of Agrippina Maior.” American Journal of Ancient History 4: 125–43.
[49]
Ptolemy of Mauretania - Ptolemaic Kings - Alexander the Great
In 40 CE, Caligula summoned Ptolemy to Rome under the pretext of a visit. Upon his arrival, Ptolemy was executed on Caligula's orders, ending the independent ...<|separator|>
[50]
[PDF] Title Caligula, Ptolemy of Mauretania, and the danger of long hair ...
Suetonius claims that Caligula had king Ptolemy of Mauretania executed simply because the splendour of his cloak (abolla) had attracted popular attention ...
[51]
The Death of Ptolemy of Mauretania - jstor
These events must have occurred in the first half of 40,27 since on Ptolemy's death conflict broke out in Mauretania and was only temporarily settled before ...
[52]
Caligula killed a king of Roman Morocco over a purple cloak
Jan 9, 2025 · Ptolemy, the last king of Mauretania, which included parts of modern-day Morocco, was executed by Roman Emperor Caligula in 40 AD over a purple cloak.
[53]
PTOLEMY OF MAURETANIA EXECUTED BY CALIGULA ...
Ptolemy then reigned until 40, when he was executed by Emperor Caligula, his mother's great nephew, who was probably jealous of Mauretania's wealth.
[54]
Caligula - Roman Emperor - UNRV.com
Gaius Caesar, now known to history as the third Roman emperor Caligula, was the son of the popular general and dynastic heir, Germanicus, and great grandson ...Missing: donative | Show results with:donative
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https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Caligula*.html#30
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https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Caligula*.html#15
[57]
https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Caligula*.html#26
[58]
https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Caligula*.html#28
[59]
https://www.roman-empire.net/people/caligula
[60]
Caligula AD 12-41 - Life and struggles of courageous emperor
Gaius Julius Caesar Germanicus was the third son of Germanicus (nephew of Tiberius) and Agrippina the elder and was born at Antium in AD 12.
[61]
The Emperor Caligula's Unlikely Role Model | Alexander Meddings
Feb 12, 2022 · Caligula also introduced Rome to an eastern practice called proskynesis. Though it had different forms, it traditionally involved bowing and ...
[62]
Europe | Caligula 'thought he was a god' - BBC NEWS
Aug 8, 2003 · Archaeologists say they have found evidence that proves Roman emperor Caligula thought he was a living deity.
[63]
Roman dig backs ancient writers' portrait of megalomaniac Caligula
Aug 8, 2003 · British and American archaeologists digging in the Roman Forum said yesterday they had uncovered evidence to suggest that the emperor Caligula ...
[64]
[PDF] caligula's statue for the jerusalem temple and its relation to the ...
In late AD 40, the emperor Caligula announced that a statue of himself, por- trayed as the Roman god Jupiter, would be placed in the Temple at Jerusalem.
[65]
Jewish peasants block construction of statue of Gaius Caligula in ...
Towards the end of the reign of Gaius Caligula, a proclamation was sent out for a statue of the Roman Emperor to be built within the Temple walls in Jerusalem.
[66]
Ancient Rome and Judea: Caligula and the Temple of Jerusalem
Oct 25, 2019 · Caligula was the first emperor to try to force Jews to participate in the imperial cult. He was also, as it happens, the last. Article by ...Missing: divinity | Show results with:divinity
[67]
Caligula and the Jews | Larry Hurtado's Blog - WordPress.com
Jul 30, 2013 · There's an excellent article about the statue affair by Per Bilde (1978, 'The Roman Emperor Gaius (Caligula)'s Attempt to Erect his Statue in ...
[68]
(PDF) Caligula's Statue for the Jerusalem Temple and Its Relation to ...
At the instigation of some of his anti-Jewish associates, Caligula devised a plan to break the spirit of the Jews and to establish his cult among them. A ...
[69]
Roman Emperor Caligula Orders Statue Placed in Temple
In 38 CE, the Roman Emperor Caligula (reign: 37-41 CE) ordered statues of himself to be placed in the Temple in Jerusalem as well as in the synagogues in Egypt.<|separator|>
[70]
Caligula - New World Encyclopedia
Caligula was the third Roman Emperor and a member of the Julio-Claudian dynasty, ruling from 37 CE to 41 CE. Known for his extreme extravagance, eccentricity, ...Missing: achievements | Show results with:achievements
[71]
Was Caligula Really Insane? - Tales of Times Forgotten
Aug 5, 2020 · In reality, it's an entirely fictional scenario based on nothing but Suetonius's claim that Caligula had sex with his sisters and the writers of ...
[72]
Caligula revisited - Hektoen International
Sep 5, 2025 · Suetonius and Dio Cassius provide the main descriptions of Caligula's life story, but fragmentary material from other authors also exists. His ...
[73]
[PDF] i Caligula Unmasked - OhioLINK ETD Center
Many of the literary sources assert that Caligula had mental issues throughout their narratives. during thunderstorms, and Tiberius was said to be so terrified ...<|control11|><|separator|>
[74]
Mythbusting Ancient Rome – Caligula's Horse - The Conversation
May 3, 2017 · On the subject of Caligula's horse, the ancient sources are unambiguous in their testimony: he was not made a consul.
[75]
Caligula - the Mad Emperor who Declared War on the Sea
The emperor Caligula (37-41 CE) has gone down as one of Rome's worst. During his short reign, the mad, bad, and dangerous-to-know emperor caused mayhem ...
[76]
Did Caligula Really Make His Horse a Consul? - History.com
Jun 21, 2016 · While Caligula might have had an unusual fondness for his horse, it's unlikely the emperor went so far as to appoint the stallion.
[77]
(PDF) Caligula, Incitatus, and the Consulship - Academia.edu
The famous allegation that Caligula had wished to appoint his horse Incitatus ('Rapid') as consul represents a misunderstanding of a joke that he had made ...
[78]
https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/59*.html
[79]
Caligula's Severe Illness (Late 37 CE) - Dr. Tashko
May 21, 2025 · The exact nature of Caligula's illness remains unknown. Ancient accounts mention fever, mental confusion, and episodes of delirium. Modern ...
[80]
THE MADNESS OF THE EMPEROR CALIGULA
Although Philo Judaeus believed that Caligula's illness in A.D. 37 altered his character radically, Balsdon points out that other authorities arenot clear on ...
[81]
Caligula: a neuropsychiatric explanation of his madness - PubMed
It is plausible that Caligula experienced epilepsy that began in childhood, later experienced status epilepticus in 37 CE, which triggered an epileptic ...Missing: Cassius Dio
[82]
Caligula: a neuropsychiatric explanation of his madness
Because of the previously mentioned, this review will focus on lead poisoning and epilepsy. ... This may not necessarily be evidence against the epilepsy theory ...
[83]
Caligula: a neuropsychiatric explanation of his madness A brief ...
Jun 9, 2021 · It is plausible that Caligula experienced epilepsy that began in childhood, possibly with febrile seizures and later dialeptic or cognitive seizures.
[84]
Caligula's disease « IMPERIUM ROMANUM
Nov 17, 2022 · This clinical condition could also be influenced by excessive alcohol consumption and lead poisoning. Read more. Caligula.
[85]
The madness of Emperor Caligula - by Sebastián Panatt - SP Historian
Mar 1, 2025 · Suetonius comments that as a child Caligula suffered from epilepsy and was aware that he had a mental illness (Calig. 50). It could be said that ...Missing: quote | Show results with:quote
[86]
Understanding Caligula: The Role of Illness and Power - eric dorfman
Feb 18, 2025 · ... lead poisoning, encephalitis, epilepsy, genetics, and the corrupting nature of power may explain his decline. His tragic story warns against ...
[87]
What Led to the Assassination of Emperor Caligula? - TheCollector
Oct 31, 2023 · There was also the matter of the Caligula's German bodyguard, who went on a murder spree, killing those involved and those suspected of plotting ...Missing: facts | Show results with:facts
[88]
Caligula and slaughter on Palatine Hill - IMPERIUM ROMANUM
May 20, 2023 · Caligula was assassinated on January 24, 41, after reigning for less than four years. The very fact of the murder of the emperor is beyond doubt.
[89]
The Assassination of Roman Emperor Caligula, January 24 41 A.D.
Jan 28, 2023 · As a result, his mother and brothers were accused of treason. However, Caligula managed to avoid this fate and was adopted by Tiberius in 32.<|separator|>
[90]
in the First Century. The Roman Empire. Emperors. Claudius | PBS
Caligula's murder in 41 AD changed everything for Claudius. Unexpectedly, the family fool had become emperor. Discovered trembling in the palace by one of ...Missing: assassination | Show results with:assassination
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10 Facts About Emperor Claudius | History Hit
Nov 29, 2021 · Claudius became emperor on 25 January 41 and changed his name to Caesar Augustus Germanicus to legitimise his rule, becoming the most powerful ...
[92]
Palatine Plot: The Death of the Emperor Caligula - TheCollector
Feb 2, 2025 · ... damnatio memoriae. Also known to scholars as “memory sanctions ... Raffaele Perscichini, The Assassination of Caligula, murdered by his ...
[93]
[PDF] Senatorial Bias in the Portrayal of Gaius Caligula - PDXScholar
Jan 22, 2020 · The topic of bias in the primary sources on Caligula could make scholars reconsider. 34 Josephus, The Works of Josephus: Complete and ...Missing: policies | Show results with:policies
[94]
Rewriting history: damnatio memoriae in ancient Rome - Smarthistory
Instead it is Nerva, who succeeded Domitian after his assassination and subsequent damnatio memoriae. As in the Claudius pontifex maximus statue from ...
[95]
Memory Sanctions, Caligula's Portraits and the Richmond Togatus.
Beyond 'Damnatio Memoriae': Memory Sanctions, Caligula's Portraits and the Richmond Togatus. Eric Varner. After his assassination on 24 January A.D. 41, ...Missing: succession | Show results with:succession
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Damnatio Memoriae: How the Romans Erased People from History
Mar 2, 2020 · Damnatio Memoriae: How the Romans Erased People from History ... Messalina was briefly detained, but ultimately put to death by Claudius's ...
[97]
https://www.forumancientcoins.com/numiswiki/view.asp?key=Caligula%2520-%2520Damnatio
[98]
Caligula by Aloys Winterling - Paper - University of California Press
Offering not an apology for the 'mad' emperor but a thoughtful argument for his sanity, Winterling debunks Caligula's most grotesque and oft repeated crimes.
[99]
Rome's Most Infamous Emperor: Was Caligula Mad or Bad?
Aug 26, 2019 · Modern Critics: He Was Not Mad. In 2003, Aloys Winterling went as far as criticizing other historians for, “inventing the mad emperor.
[100]
Was Caligula a madman? Maybe. But he also knew his medicine ...
Jul 9, 2025 · The Roman Emperor Caligula, notorious for his blood lust, may have had a strong general knowledge of medicine, according to a new study.Missing: promotion | Show results with:promotion<|separator|>
[101]
Monster: The Coins of Caligula - CoinWeek
Jun 8, 2018 · Perhaps the best-known coin of Caligula is a rare sestertius that depicts his three sisters, Agrippina the Younger, Drusilla and Julia Livilla ...Missing: verifiable facts
[102]
coin - British Museum
A notable feature of the coinage of Caligula is the honour paid to members of the emperor's family - in the instance of his mother Agrippina. Gold coin.Missing: verifiable facts
[103]
Coins of Caligula - A Story in The Metals | Mintage World
Some have the inscription “Divine Augustus, Father of the nation”. Other types of coins found are the bronze sestertius which he generously distributed amongst ...Missing: verifiable | Show results with:verifiable
[104]
https://www.forumancientcoins.com/numiswiki/view.asp?key=Caligula%20Epigraphy
[105]
https://www.forumancientcoins.com/numiswiki/view.asp?key=Caligula%20-%20Provincial%20Coinage
[106]
Ruins of the ancient garden belonging to Emperor Caligula ...
Jul 5, 2024 · Archaeologists have unearthed the remains of an ancient garden belonging to the notorious Roman Emperor Caligula in Rome.
[107]
Caligula's Gardens, Long Hidden Beneath Italian Apartment ...
Jan 13, 2021 · Archeologists began excavating the site in 2006. Digging beneath crumbling 19th-century buildings, they found a wealth of jewelry, coins and ...
[108]
News - Monumental First-Century A.D. Garden Found in Rome
Jul 9, 2024 · Traces of a garden thought to have belonged to the emperor Caligula, who ruled from AD 37 to 41, were uncovered in Rome's Piazza Pia during a construction ...
[109]
Caligula Coin Details - The Roman Empire - NGC Collectors Society
The obverse bust on this provincial bronze bears the inscription C CAESAR AVG GERMANIC IMP P M TR P COS, advertising that Gaius Caesar Augustus Germanicus was ...