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521

521 is a natural number, specifically an odd prime that occupies the 98th position in the sequence of prime numbers and forms a twin prime pair with 523, being separated by a gap of 2. As a Mersenne exponent, 521 generates the Mersenne prime $2^{521} - 1, which was verified as prime in 1952, contributing to the study of these rare forms significant in number theory for their role in prime distribution and computational challenges. Distinctively, it holds the property of being the smallest prime whose decimal reversal, 125, is a perfect cube ($5^3), highlighting curiosities in digit manipulation among primes. These attributes underscore 521's relevance in mathematical exploration, from basic primality tests—divisible only by 1 and itself—to advanced applications in cryptography and probabilistic models of primes.

Events

Events in the Byzantine Empire and Eastern Mediterranean

Justinian, nephew and adopted heir of Emperor (r. 518–527), was appointed in 521 at the age of approximately 39, a prestigious office that solidified his prominence within the imperial administration. This appointment occurred amid Justin's efforts to consolidate orthodox Christian doctrine and mend relations with the Western church following the , though Justinian's role emphasized military and administrative ascent. The consulship's inauguration featured extravagant displays funded by the imperial treasury, reflecting the era's emphasis on ceremonial pomp to project strength amid ongoing border tensions with the in the east. No major military campaigns were recorded in the provinces during 521, as the maintained relative stability under Justin's rule, with focus shifting toward internal reforms and preparations for future conflicts, including Justinian's subsequent command over the Army of the East. Diplomatic exchanges with Persian envoys continued, but escalated hostilities leading to the would not commence until 526. Provincial governance in regions like and proceeded routinely, with tax collection and infrastructure maintenance supporting the empire's fiscal base, though specific administrative actions for the year remain sparsely documented in primary sources.

Events in Western Europe

In the Frankish kingdoms of , the sons of maintained control over their partitioned realms established after his death in 511, with Thierry I ruling from , Clodomir governing , holding , and Clotaire I administering ; no major conflicts or territorial expansions are documented for this year. Clodomir's marriage to Guntheuca, widow of his uncle and a Burgundian , occurred around 514 or possibly 521, strengthening ties between the and . The in remained under the regency of , Ostrogothic king of , who acted as guardian for his grandson following the defeat at Vouillé in 507 and the death of ; this arrangement persisted until Theodoric's death in 526, ensuring Ostrogothic influence over Iberian affairs without recorded disruptions in 521. In Ostrogothic , the Roman administrative traditions continued under Theodoric's rule, marked by the consular appointment of the Roman senator Venantius Opilio on January 1, 521, as junior colleague to Byzantine Emperor , symbolizing the nominal persistence of imperial forms amid Germanic dominance.

Events in Arabia

In 521, Maʿdīkarib Yaʿfur, the Himyarite king of installed by the Christian following their invasion in 519, conducted a significant expedition northward into central Arabia. The campaign targeted (Sasanian) allies, including the Lakhmid under al-Mundhir III in , as evidenced by a Himyarite inscription (Ry 510) describing operations from Maʾsal Jumḥ against these forces. Maʿdīkarib received support from local Arab tribes such as the Banū Thaʿlabat and Muḍar, highlighting fragile alliances amid struggles between Aksum, Persia, and Byzantine interests. This expedition reflected Himyar's position as an Aksumite proxy in countering Sasanian expansion along trade routes, though Maʿdīkarib's rule ended soon after, around 522, when the Jewish Himyarite leader ( As'ar Yath'ar) seized power and initiated persecutions against . No major natural or cultural events specific to 521 are recorded in northern or central Arabian tribal territories, where nomadic groups continued dominance amid ongoing commerce and intertribal conflicts.

Religious developments

The death of on November 29, 521, concluded the career of one of the most prolific Christian theologians and poets of the early sixth century. Serving as of Batnan from 519 until his death, Jacob composed over 700 metrical homilies (mimre) that systematically expounded biblical narratives, emphasizing Christ's divine and human natures in a miaphysite framework while avoiding direct engagement in the era's Christological controversies following the . His works, transcribed by approximately seventy scribes, reinforced scriptural orthodoxy and Mariological devotion within Syriac-speaking communities of the Byzantine Empire's eastern provinces, influencing subsequent liturgical poetry and in non-Chalcedonian traditions. This event underscored the vitality of Syriac literary theology amid regional ecclesiastical tensions, as Jacob's avoidance of polemics allowed his output to serve as a stabilizing force for doctrinal education in local churches.

Cultural and scientific advancements

Anicius Manlius Severinus advanced classical philosophy's transmission to medieval through his Latin commentaries on 's logical works, including those on the Topics and , composed circa 521–524. These texts offered systematic of syllogistic reasoning and topical argumentation, bridging Greek originals with Latin audiences and influencing later thinkers like Abelard and Aquinas by standardizing logical terminology and methods. ' approach emphasized precise translation fidelity and Neoplatonic harmonization of with , countering the era's cultural fragmentation following the Western Roman Empire's fall. No major empirical scientific breakthroughs are recorded for 521, reflecting the period's focus on preservation over innovation amid and the Mediterranean. ' contemporaneous treatises on arithmetic and , though initiated earlier, complemented his logical output by systematizing quadrivial sciences, aiding monastic and foundational . In the , Byzantine scholars continued Hellenistic traditions, but specific advancements tied to 521 remain undocumented in surviving sources.

Natural disasters

No significant natural disasters are recorded for the year 521 in surviving historical sources from the or neighboring regions. Chronicles such as that of Marcellinus Comes, a contemporary imperial official who documented events from 378 to 534 AD, focus on appointments, diplomatic exchanges, and political developments without referencing earthquakes, floods, droughts, volcanic activity, or famines during this specific year. Similarly, and histories from and the , including those preserved in or Latin traditions, omit any catastrophic natural events tied to 521. The , a seismically active zone, experienced notable earthquakes in adjacent years—such as the 502 AD event along the Dead Sea Transform fault and the devastating 526 AD quake—but scholarly compilations confirm no verified shocks of magnitude or impact warranting record in 521. Regional or patterns, often noted in proxy records like tree rings or sediment cores for the early sixth century, do not align with acute crises in this annum. This relative quiescence contrasts with the broader late antique trend of intermittent hazards, including preceding the AD volcanic , but underscores the patchiness of pre-modern documentation, which prioritized over environmental upheavals unless they disrupted imperial stability. Lack of attestation in cross-referenced catalogs from seismologists like Nicholas Ambraseys further supports the conclusion that 521 passed without disasters of historical magnitude.

Births

Notable individuals born in 521

Saint Columba (c. 521–597), also known as Colum Cille, was an abbot and missionary of royal descent from the Cenél Conaill branch of the dynasty. Born in Gartan, , on December 7, he founded the monastery on in 563, from which he directed evangelistic efforts that contributed to the Christianization of the in northern Britain. His , including accounts of miracles and encounters such as the calming of a , reflects early medieval traditions but underscores his role in preserving monastic learning. Simeon Stylites the Younger (521–592) was a Syrian ascetic who emulated his father's pillar-dwelling practice, living atop a column near from age 18 until his death. Born to pious parents John and in , he attracted pilgrims seeking his counsel and reported healings, establishing a monastic community at the site known as Wonderful Mountain. His extreme asceticism, involving minimal food and exposure to elements, exemplified Eastern Christian eremitic traditions amid the 6th-century Byzantine religious landscape.

Deaths

Notable individuals who died in 521

Jacob of Serugh (c. 451 – November 29, 521) was a Syriac poet-theologian who served as bishop of Batnan from 519 until his death. He composed numerous metrical homilies interpreting biblical narratives, requiring the assistance of seventy scribes to transcribe his works due to his prolific output. His writings emphasized Christological themes and drew from earlier Syriac traditions, influencing later Eastern Christian literature. Magnus Felix Ennodius (c. 473/474 – July 17, 521) was a Gallo-Roman rhetorician, , and of from 514. Born in Arles, he pursued a secular career in law and oratory before entering the clergy around 493, eventually becoming deacon and then . Ennodius authored panegyrics, letters, and defenses of against , contributing to the literary preservation of late antique Latin prose amid Ostrogothic rule in Italy. Buithe (d. 521), also known as Buite or Boetius, was an saint and founder of the monastery at in . He established the site as a center of learning and monastic life in the late 5th or early , with traditions linking his death to the year of Columba's birth. The monastery endured as a key ecclesiastical foundation, later associated with high crosses and scriptoria work, though exact details of his continental travels remain hagiographic.

References

  1. [1]
    Properties of the number 521 - Number Empire
    Number 521 is a prime number. The prime number before 521 is 509. The prime number after 521 is 523. It is also twin prime. The gap to the next prime is 2.
  2. [2]
    Prime numbers - MacTutor History of Mathematics
    Prime numbers and their properties were first studied extensively by the ancient Greek mathematicians. ... In 1952 the Mersenne numbers M 521 , M 607 , M ...
  3. [3]
    Prime Curios! 521
    The smallest prime number whose reversal is a cube. Curiously, its sum of digits equals the smallest prime cubed. [Honaker].Missing: properties | Show results with:properties
  4. [4]
    Justinian I - World History Encyclopedia
    Sep 28, 2012 · During Justin's reign, Justinian acted as a close confidant and advisor; he became Consul in 521 CE and thereafter commander of the Eastern army ...
  5. [5]
    Roman Emperors - DIR Justinian
    Jul 25, 1998 · In 521, Justinian himself became consul, and his inauguration was a blatantly lavish affair, designed to make his mark. In that year, too, we ...
  6. [6]
    The Byzantine State under Justinian I (Justinian the Great)
    Apr 1, 2009 · Justinian's rise to imperial power began in 527 with his appointment as co-emperor to Justin I, his uncle, who died later that same year. His ...
  7. [7]
    MEROVINGIANS - Foundation for Medieval Genealogy
    Gregory reports that Chlodio was the first Frankish leader to invade Roman-occupied Gaul, as far as the river Somme[7]. He attributes to him the title "King of ...<|separator|>
  8. [8]
    Theodoric "the Great," king of the Ostrogoths - Geni
    Sep 8, 2025 · King Theodoric acted nominally as regent in the kingdom of the Visigoths 507-526 during the minority of his grandson Amalric King of the ...
  9. [9]
    [PDF] St. Ambrose and the architecture of the churches of northern Italy
    matter of far more significance than historical accuracy. The history of St ... Venantius Opilio, who may have been a prefect of Theodoric.671 The ...
  10. [10]
    Timeline of Arabs and Arabia : r/arabs - Reddit
    Oct 17, 2022 · AD 521 Maʿdīkarib Yaʿfur leads an expedition into central Arabia against the Iranians and their Arab allies. He receives the support of the ...
  11. [11]
    [PDF] The political map of Arabia and the Middle East in the 3rd century ...
    Oct 26, 2016 · 57 In AD 521, the Ḥimyarite king Maʿdīkarib Yaʿfur launched an expedition from the same location of Maʾsal Jumḥ against al-Mundhir (III) ...
  12. [12]
    Writing the History of the “Persian Arabs”: The Pre-Islamic ...
    Jan 1, 2022 · ... 521. The inscription describes the Axumite-appointed Ḥimyarite king Maʿdīkarib Yaʿfur (519–22) campaigning against al-Mundhir in lower Iraq ...
  13. [13]
    Muḍar Christian Julien Robin Name of a tribe or of a ... - Facebook
    In June 521, the Ḥimyarite king Maʿdīkarib Yaʿfur reports that he was assisted by “the banū Thaʿlabat and Muḍar” (Ry 510/8, bny Ṯʿlbt w-Mḍr) during a raid ...<|separator|>
  14. [14]
    the rise and fall of Joseph dhu Nuwas - University of Texas at Austin
    In 517 CE, a man called Yūsuf 'As'ar Yath'ar, but whom we know under the name Joseph dhu Nuwas, rose to take power over the Jewish Ḥimyarite kingdom.
  15. [15]
    History of Arabia - Islamic Empires, Bedouin Tribes, Arabian Peninsula
    Furthermore, members of the Quraysh house of ʿAbd Manāf concluded pacts with Byzantium, Persia, and rulers of Yemen and Ethiopia, promoting commerce outside ...
  16. [16]
    Jacob Of Serugh | Syrian Poet, Christian Theologian - Britannica
    Serugh also spelled: Sarug ; Born: 451, Curtam [now Qurṭmān], Syria ; Died: November 521, Baṭnan, Osroëne [now in Turkey] (aged 70).
  17. [17]
    Jacob of Serugh, Homily extracts, tr. by R.H.Connolly. The Downside ...
    He died on November 29, 521. Jacob was a Monophysite; but he seldom alludes to the great controversy of his day. So little are his writings tainted with ...
  18. [18]
    The Year of Jacob of Serugh ( 521) - The Hidden Pearl
    He remained in this office for two-and-a-half years until his death on November 29, 521. Being a prolific writer, Jacob needed seventy amanuenses to write down ...
  19. [19]
    Authors/Boethius - The Logic Museum
    May 8, 2021 · 521-524 ... There may also have been commentaries on Aristotle's Topics and Prior and Posterior Analytics in this period. Editions. De ...
  20. [20]
    Anicius Manlius Severinus Boethius
    May 6, 2005 · Anicius Manlius Severinus Boethius (born: circa 475–7 CE, died: 526? CE) has long been recognized as one of the most important intermediaries between ancient ...The Logical Project and the... · Boethius's Influence and... · Bibliography
  21. [21]
    Boethius | Internet Encyclopedia of Philosophy
    Boethius (480-524). Boethius was a prolific Roman scholar of the sixth century AD who played an important role in transmitting Greek science and philosophy ...
  22. [22]
    Marcellinus Comes - The Latin Library
    MARCELLINI COMITIS V. C. CHRONICON (Mommsen, Chronica Minora II, 1894). Praefatio. Post mirandum opus quod a mundi fabrica usque in Constantinum principem ...
  23. [23]
    Two Inferred Antique Earthquake Phases Recorded in the Roman ...
    Nov 4, 2020 · Five were probably coastal earthquakes (A.D. 233, 303/306, 347, 502, and 551), whereas eight were produced by displacement along the DST fault ( ...
  24. [24]
    [PDF] Earthquakes in the Mediterranean and Middle East Nicholas Ambr
    AD 1681 earthquakes 520–521. AD 1779 December 6 earthquake 608–609. AD ... AD 1684 earthquakes 521. AD 1688 September 10 earthquake 524. AD 1694 March 5 ...<|separator|>
  25. [25]
    Colum Cille (Columba) - Dictionary of Irish Biography
    Colum Cille (Columba) (c. 521–597), founder of the monastery of Iona, was born into the Cenél Conaill, a branch of the Uí Néill, then Ireland's most powerful ...Missing: notable | Show results with:notable
  26. [26]
    BORN TODAY, COLUMBA BECAME A FAMOUS IRISH SAINT
    TRADITION SAYS Columba was born in Gartan, Ireland, on this day, 7 December 521. He was of a noble family. Originally he was named Criomhthan, meaning “fox” but ...Missing: notable figures
  27. [27]
    Venerable Simeon Stylites the Younger of Wonderful Mountain
    May 24, 2017 · Saint Simeon the Stylite was born in the year 521 in Antioch, Syria of pious parents John and Martha. From her youth Saint Martha (July 4) ...
  28. [28]
    Yaʿqub of Serugh
    The date of his death is given as 29 Nov. 521 in the notice published in BibOr, and this is the date of his liturgical commemoration; other sources, however ...
  29. [29]
    (PDF) JACOB OF SARUG: A POET-THEOLOGIAN - Academia.edu
    It is believed that Jacob died on 29th November 521, at the age of seventy. ... Jacob of Serugh's homilies on the Spectacles of the Theatre,” 88. 26 See ...
  30. [30]
    Saint Magnus Felix Ennodius (474–521) - WEHD.com
    He died on the 17th of July 521; his epitaph still exists in the basilica of St. Michael at Pavia (Corpus Inscriptionum Latinarum, v. pt. ii. No. 6464).
  31. [31]
    Saint of the Day – 17 July – Saint Magnus Felix Ennodius (c473-521 ...
    Jul 17, 2025 · Around 493, we know, Ennodiush entered the Clergy of Pavia, whose Bishop was Epiphanius, who died on 21 January 496 (or 498). Our Saint then ...
  32. [32]
    Ennodius, Magnus Felix, Saint | DLL Catalog
    Magnus Felix Ennodius. Author Name English. Magnus Felix Ennodius. Author ... 474 A.D.. Author Death Date. 521 A.D.. Floruit/Active. 6th Century A.D.. Time ...
  33. [33]
    Buite - Dictionary of Irish Biography
    Buite (d. 521) was the founder of the monastery of Mainistir Buite (Monasterboice, Co. Louth), and is a saint in the Irish tradition.
  34. [34]
    Saint Buite of Monasterboice, December 7
    Dec 7, 2013 · 7. BUITE, i.e., Boetius, Bishop of the Monastery. It was in the year of our Lord 520 that he died, i.e., the day on which Colum Cille was born, ...
  35. [35]
    Buite m. Brónaig of Monasterboice - Saints in Scottish Place-Names
    This life brings Buite to Pictland, where he raises a king called Nechtan from the dead and is given a fortress (which some have identified with Kirkbuddo).