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Thuluth

Thuluth is a and proportional renowned for its elegant, flowing lines and balanced proportions, deriving its name from the word meaning "one-third," which refers to the of the curved portion's to the full or the pen width being one-third that of a larger called tumar. Originating in the during the 7th century in , Thuluth was developed by the calligrapher Qutba al-Muharrir and initially served as a decorative style with intersected and pointed letters, primarily for titles and architectural inscriptions rather than full Qur'anic texts. By the 10th to 13th centuries, it was codified as one of the six major proportional scripts known as the "Six Pens" (al-aqlām al-sitta), using a system of rhombic dots to standardize letter forms, which facilitated its widespread adoption across the with the rise of fine production in the 11th century. Characterized by tall vertical shafts balanced by sweeping horizontal curves, leftward slanting strokes, and hooked endings on descending letters, Thuluth exudes grace and monumentality, making it ideal for large-scale applications where both and aesthetic impact are essential. It has been extensively used in Qur'ans, decorations, imperial documents, stone inscriptions, metalwork, ceramics, textiles, and manuscripts, from medieval like the in the in to later examples in regions such as during the Mongol period.

Introduction

Definition and Basic Features

Thuluth is an calligraphic whose name derives from the word thuluth, meaning "one-third" in , a reference to the proportional rule where approximately one-third of each letter's height consists of sloped or extended elements. This elegant style emerged as a foundational form in , emphasizing harmonious proportions and aesthetic refinement over utilitarian simplicity. Distinguished by its curved and oblique lines, Thuluth supplanted the angular rigidity of earlier scripts, introducing a sense of fluidity and dynamic motion that enhances its visual appeal. The script's large-scale letters, sweeping strokes, and inherent ornamental potential make it particularly suited for monumental and decorative applications, while its technical complexity—demanding precise control and proportional mastery—earns it the title of the "mother of scripts" in traditions, serving as a key benchmark for accomplished calligraphers. As one of the six principal scripts in —alongside muḥaqqaq, rayḥānī, naskh, tawqīʿ, and riqāʿ—Thuluth holds a primarily decorative role, favored for titles, inscriptions, and artistic expressions rather than routine textual utility.

Cultural and Artistic Significance

Thuluth calligraphy embodies divine beauty and harmony in , serving as a visual manifestation of spiritual ideals that align with the faith's emphasis on tawḥīd (divine unity). By prioritizing intricate script over figurative imagery, it reflects the principles of central to , transforming written words into a medium for contemplation and connection to the sacred. This symbolic role is particularly evident in its use to convey Qur'anic verses and other sacred texts, evoking a sense of reverence and that elevates the viewer's experience beyond the material world. Artistically, Thuluth is prized for its majestic and imposing presence, characterized by sweeping curves and balanced proportions that convey grandeur and elegance. This style has profoundly influenced broader Islamic aesthetics, integrating into the rhythms of through illuminated manuscripts, the monumental designs of , and the contemplative practices of , where its forms inspire iḥsān (excellence in ). Regarded as a pinnacle of calligraphic mastery, Thuluth demands exceptional skill, with the traditional adage holding that a true calligrapher must first "conquer" its complexities to achieve proficiency in the art. The cultural impact of Thuluth extends across the , , and worlds, where it has symbolized refinement, piety, and cultural sophistication since its prominence in the . Its adaptability allowed it to unify diverse artistic traditions, blending local motifs with shared Islamic motifs to foster a sense of communal identity and heritage. In regions from to , Thuluth's enduring prestige continues to bridge historical and contemporary expressions of , reinforcing its role as a timeless emblem of Islamic cultural unity.

Historical Development

Origins and Early Evolution

Thuluth script originated during the in the CE, primarily in , where it was developed as an early style by the calligrapher Qutba al-Muharrir, with influences extending to Persia as transitioned from the rigid, angular forms of the earlier script toward more fluid and elegant styles. This evolution introduced curved and oblique lines, enhancing the script's expressiveness and adaptability for artistic applications while retaining a sense of proportion and harmony. By the late , preliminary developments in scripts laid the groundwork for Thuluth's further refinement, marking a shift from the monumental, square-like used in early Qur'anic manuscripts to a more dynamic form suited to the cultural flourishing of the era. A pivotal figure in Thuluth's early standardization was (d. 940 CE), a Baghdad-based , , and calligrapher who transformed the script through a systematic approach grounded in geometric principles. He established proportional rules based on the (the vertical stem) and the , using circles and arcs to define letter forms, which elevated Thuluth from an informal variant to a measured and aesthetically refined style. This innovation, developed amid the intellectual vibrancy of Abbasid , addressed the limitations of Kufic's angularity by promoting balance and rhythm, making Thuluth a foundational script for subsequent calligraphic traditions. In its initial phases through the , Thuluth found primary application in decorative contexts, such as architectural inscriptions on mosques and illuminated manuscripts, where its sweeping lines complemented ornamental motifs. Slight modifications during this period also spurred the development of companion scripts, notably Naskh, which adopted Thuluth's cursive fluidity for more practical, everyday writing while maintaining proportional elegance. These early transformations in and centers solidified Thuluth's role as a bridge between archaic and modern Arabic scripts, influencing religious and artistic expressions across the .

Classical and Medieval Advancements

During the classical era, Thuluth calligraphy underwent significant refinements that elevated its ornamental qualities and established it as a premier decorative script. Ibn al-Bawwab (d. 1022 CE), building on the proportional system of six scripts pioneered by , introduced greater softness and rounded forms to Thuluth, enhancing its elegance and suitability for illuminated manuscripts and inscriptions. These advancements emphasized rhythmic flow and aesthetic balance, transforming Thuluth from an early style into a more refined artistic medium. In the medieval period, Yaqut al-Musta'simi (d. 1298 CE) further perfected Thuluth among the six standard scripts, introducing the oblique cut to the that imparted a dynamic slant and improved the script's visual rhythm. Yaqut's innovations included enhanced ornamental elements, such as barbed heads on letters, which added intricate detailing and contributed to the script's flowing, interconnected appearance. His work, preserved amid the Mongol sack of , solidified Thuluth's classical proportions while adapting it for expressive, monumental applications. Thuluth flourished regionally during the 12th to 15th centuries, with notable developments in and that bridged its early evolution and later elaborations. In , the script adapted to local artistic traditions, appearing in a variant suited for architectural on and objects like metal finials, where its cursive elegance complemented Persian decorative motifs. This Persian-influenced Thuluth emphasized elongated forms and with floral patterns, paving the way for styles in illumination. In and , Thuluth reached new heights in monumental works, including large-scale inscriptions on mosque lamps, candlesticks, and architectural panels, often rendered in bold, heavy strokes for visibility and grandeur. These applications highlighted the script's versatility, with increased use in Qur'anic and metalwork that showcased its rhythmic proportions. A key medieval advancement was the integration of harakat (vowel marks) into Thuluth, a feature largely absent in the angular script it succeeded, which improved readability without compromising its decorative intent. These diacritical marks, often rendered in colored inks like green or gold, allowed for precise indication in religious texts while enhancing the script's visual . This supported Thuluth's growing role in architectural and liturgical contexts across the . During this era, the script also began evolving toward Thuluth, a bold, interlaced variant with floral embellishments designed for large-scale inscriptions, as seen in Mamluk-era examples that intertwined letters with arabesque motifs for heightened ornamental effect.

Ottoman and Post-Classical Periods

During the era, Thuluth attained its zenith, particularly through the innovations of Sheikh Hamdullah (d. 1520 CE), who founded the school of and refined the script into a distinctive style characterized by sweeping curves and enhanced elegance. Encouraged by Sultan Bayezid II, Hamdullah adapted classical proportions from earlier masters like Yaqut al-Musta'simi, creating fluid forms suited to monumental applications that emphasized grandeur and readability. This evolution marked a shift toward an aesthetic, integrating Thuluth with architectural elements in imperial mosques, where (bold) variants adorned inscriptions on facades, mihrabs, and domes, as seen in the in . Additionally, Thuluth featured prominently in official seals and documents, complementing sultanic tughras—calligraphic monograms typically in divani script but often paired with Thuluth headings for imperial decrees and endowments. In the post-classical period, Thuluth persisted and adapted across regions influenced by expansion, notably in and Safavid Persia, where it retained its role in illumination and architectural decoration. In Safavid Persia, Thuluth formed part of the six canonical scripts, used for Qur'anic titles and ornamental panels in royal albums during the 16th and 17th centuries. Similarly, in , the script blended with influences, appearing in inscriptions and album folios, reflecting a synthesis of and local traditions under emperors like and . However, by the , the introduction of the accelerated the decline of handwritten Thuluth, reducing demand for calligraphers as mass-produced texts supplanted ; in alone, the number of practitioners dropped sharply from around 1,500 pre-press to a thereafter. Ottoman reforms in the , amid the modernization efforts, helped preserve Thuluth through institutional support, with medreses and emerging art schools serving as strongholds for its teaching amid the esnaf (guild) system's deterioration. These initiatives maintained pedagogical lineages, ensuring the script's transmission despite technological shifts. In the 20th century, revival movements emerged in and the , driven by cultural institutions and artists who standardized proportions for contemporary use, adapting Thuluth to and public monuments while honoring classical forms. 's 2021 recognition of as further bolstered these efforts, fostering workshops and exhibitions across the region.

Characteristics and Techniques

Proportional Principles

The proportional principles of Thuluth calligraphy are rooted in a systematic measurement framework established by the 10th-century calligrapher , who developed a canon limiting Arabic scripts to six primary styles, including Thuluth, to ensure visual harmony and geometric precision. This system employs the rhomboid dot—also known as the nuqta—as the fundamental unit of measurement, formed by pressing the angled tip of the (qalam) downward, creating a diamond-shaped mark whose side length equals the pen's nib width. The qalam is typically cut at an oblique angle of 35-45 degrees to produce this rhomboid shape, allowing for consistent stroke formation; letter heights in Thuluth generally range from 3 to 7 dots, with the alif serving as the primary reference at 7 dots high to achieve the script's elongated, majestic appearance. Geometric construction in Thuluth relies on ratios derived from circles, squares, and intersecting arcs to align and define letter proportions, ensuring that all elements maintain balance relative to the alif's height. For instance, the alif's vertical stem is aligned by drawing arcs that intersect at precise points, creating a baseline where subsequent letters are positioned; curves and extensions follow ratios such as a maximum horizontal bowl length of 6 dots, promoting the script's characteristic fluidity while adhering to Ibn Muqla's emphasis on proportional perfection. A key feature is the one-third extension rule for slopes, where approximately one-third of each letter's form inclines, contributing to Thuluth's dynamic yet controlled aesthetic—this proportion, reflected in the script's name meaning "one-third," dictates the tapering and elongation of strokes for visual rhythm. Thick and thin contrasts emerge from controlled pen pressure and angle variations during execution, with thicker lines formed by holding the pen more and thinner ones by tilting it obliquely. Preparation of tools is integral to these principles, as the must be freshly cut at the specified to ensure even ink flow, while —typically a of , , and water—is adjusted to a viscous consistency that prevents dripping yet allows smooth gliding across or other surfaces. This setup enables calligraphers to replicate Ibn Muqla's geometric ideals without deviation, underscoring Thuluth's reliance on mathematical precision over freehand improvisation.

Letter Forms and Stylistic Elements

In Thuluth calligraphy, vertical strokes characteristically slant leftward, imparting a dynamic inclination to the overall composition, while horizontal strokes incorporate deep, sweeping curves that enhance the script's fluidity and elegance. Descending letters, such as those in forms like dāl or yāʾ, typically terminate in upward hooks, creating a rhythmic uplift that counters the leftward lean and contributes to the script's balanced . Letters frequently intersect or interlace, fostering a seamless flow that unifies words into harmonious units, with curved elements often featuring barbed heads—sharp, pointed terminations that add a decorative edge without disrupting connectivity. Stylistic variations in Thuluth distinguish Eastern forms, prevalent in and traditions, from styles, particularly in the treatment of ligatures and overall elongation. In Eastern variants, ligatures like lām-alif are notably elongated, extending ascenders and to emphasize verticality and grandeur, often resulting in more florid, sweeping connections suited to monumental applications. forms, by contrast, tend toward subtler extensions with tighter spacing, preserving a compact yet ornate . Across both, achieves rhythmic vitality through alternating thick and thin lines—thicker in curves for emphasis and thinner in transitions for delicacy—coupled with deliberate spacing that modulates visual weight and prevents overcrowding. Executing Thuluth demands precise control to maintain proportional , as the script's flowing lines risk when scaled for large formats, where even minor imbalances in slant or curve depth can undermine the intended aesthetic poise. Calligraphers must navigate these challenges by mastering stroke modulation, ensuring that intersections remain fluid and hooks precise, a that tests and serves as a for proficiency.

Notable Calligraphers

Foundational Masters

Qutba al-Muharrir, an Umayyad-era calligrapher in Damascus during the 7th century, is credited with developing Thuluth as one of the early cursive scripts, alongside others like Tumar and Jalil. His work laid the initial foundations for Thuluth's elegant, flowing forms, primarily used in architectural inscriptions such as those on the mihrab in the Prophet's Mosque in Medina. Abu Ali Muhammad ibn Abdallah ibn Muqla al-Shirazi (885–940 CE), an Abbasid vizier and pioneering calligrapher, is credited with systematizing the six principal cursive scripts of Arabic calligraphy, including Thuluth, and establishing the foundational proportional system that elevated the art to a scientific discipline. Serving as vizier under multiple caliphs in Baghdad, he introduced a method using rhomboid dots and circles—based on the height of the alif as a unit—to ensure harmonious letter proportions, replacing the angular Kufic script with more fluid forms suitable for Thuluth's monumental applications. Legends attribute to him an extreme dedication to uniqueness, claiming he severed his own right hand to prevent imitation of his style, though this remains apocryphal. His innovations laid the groundwork for Thuluth's elegance in inscriptions and manuscripts during the 10th century. Ibn Hilal al-Bawwab (d. 1022 CE), a Baghdad-based illuminator and successor to , refined the proportional principles and ink formulations, bridging the transition from angular to rounded scripts like Thuluth. He enhanced the aesthetic softness of letters by adjusting the pen's and developing richer inks, achieving greater fluidity and balance in Thuluth forms that improved readability for texts. Notably, he produced the earliest surviving dated Quran manuscript in a script, completed in 1000–1001 CE and housed in the , which exemplifies his role in standardizing Thuluth-like proportions for religious works. His contributions solidified Thuluth as a versatile style for both decorative and practical use in the early . Yaqut al-Musta'simi (1222–1298 CE), a 13th-century master in 's Abbasid court, perfected the six scripts originated by , with particular emphasis on Thuluth's balanced proportions and its adaptation for epigraphic purposes. As a former slave who rose to prominence under Caliph , he innovated by angling the reed pen obliquely to create more dynamic curves in Thuluth letters, enhancing their visual harmony and suitability for architectural inscriptions and headings. His pedagogical influence was profound, training numerous disciples who disseminated his methods across Islamic regions, ensuring Thuluth's enduring classical form through oral and demonstrative transmission rather than written treatises. Despite the Mongol sack of in 1258 CE, Yaqut's rigorous daily practice—copying Quranic sections—preserved and elevated Thuluth as a pinnacle of 13th-century .

Ottoman and Regional Experts

Sheikh Hamdullah (1436–1520 CE), often regarded as the founder of the school of calligraphy, served as the tutor to Sultan Bayezid II and refined Thuluth and Naskh scripts to align with aesthetic principles, creating a harmonious fusion suitable for imperial documents and religious texts. His innovations emphasized balanced proportions and fluid lines, departing from earlier models to establish a distinctly Turkish elegance that became the standard for subsequent generations. Based in , Hamdullah trained numerous apprentices, ensuring the dissemination of his Thuluth adaptations across the empire during the historical peak in the 15th and 16th centuries. Hafiz Osman (1642–1698 CE), a leading calligrapher of the late , specialized in large-scale Thuluth for monumental applications, developing the jali Thuluth variant with bold, intertwined letters that amplified visibility and decorative impact. His approach integrated influences, such as refined curves from earlier Safavid models, with Ottoman simplicity, thereby highlighting underemphasized crossovers between Persian and Thuluth traditions in and religious contexts. As a teacher in , Hafiz Osman perpetuated these hybrid innovations, shaping the script's evolution through the 18th century.

Modern and Contemporary Artists

In the 20th and 21st centuries, Thuluth experienced a revival amid the decline of artistic patronage, with modern artists bridging classical techniques and contemporary expressions. Hasan Çelebi (1937–2025), a Turkish master calligrapher, played a pivotal role in preserving and globalizing Thuluth traditions. Born in , , he trained under the renowned Aytaç and received his icazet (mastery license) in Thuluth and Naskh scripts in 1971. From 1976 onward, Çelebi mentored hundreds of students from countries including the , , , and , emphasizing spiritual discipline and rigorous practice to transmit -era methods. His monumental works in Jali Thuluth adorn key Islamic sites, such as the in , the Blue Mosque in , and the in , showcasing fluid proportions adapted to architectural scales. Muhammad Aslam, a prominent Pakistani calligrapher, exemplifies the South Asian resurgence of Thuluth through his expertise in Thuluth. Renowned for intricate, openwork designs that highlight the script's sweeping curves and harmonious flourishes, Aslam has created large-scale Quranic panels for mosques and public monuments across . His precise craftsmanship preserves Thuluth's spiritual depth while contributing to regional heritage. Arash Shirinbab, an Iranian-American artist based in the , integrates Thuluth into contemporary installations, reflecting influences since the early 2000s. Beginning his studies at age 11 in and advancing under masters like Abdolreza H. Garakani in 2008, Shirinbab mastered Thuluth—a cursive script ideal for architectural and manuscript applications—alongside and Nasta'liq styles. His works blend traditional with modern media, such as wall pieces and ceramic collaborations, as seen in exhibitions like "The Earth is Broken, the Earth is Whole" (2019), where Thuluth imparts spiritual resonance to themes of and . Through over 80 exhibitions worldwide, Shirinbab mentors emerging artists and promotes Thuluth's adaptability in global contexts.

Applications and Usage

Architectural and Monumental Inscriptions

Thuluth script emerged as a prominent choice for architectural inscriptions during the medieval Islamic period, gradually replacing the earlier angular style due to its enhanced visibility from a distance, thanks to its and elongated forms that allowed for clearer on large surfaces. This shift became evident from the 10th to 13th centuries, as Thuluth's flowing lines suited monumental decorations in mosques and public buildings, emphasizing spiritual and imperial messages with greater aesthetic harmony. Its curved elegance particularly lent itself to expansive formats, creating a dynamic visual that complemented architectural curves like arches and domes. In creating large-scale Thuluth inscriptions, calligraphers employed grid systems to scale proportions accurately, ensuring that letter forms maintained their harmonious ratios when enlarged for stone, tile, or marble surfaces. Pigments, often in gold or contrasting colors against blue or green backgrounds, were applied to carved reliefs or inlaid materials, such as black stone set into white marble, to achieve durability and visual impact in mosque mihrabs, dome interiors, and facades. This technique flourished particularly in mosque architecture, where Thuluth adorned key elements like mihrabs and domes to evoke grandeur and guide worshippers' focus toward sacred texts. Prominent examples include the interior of the in , where nine marble plaques inscribed in Thuluth commemorate architectural contributions by historical rulers, alongside Quranic verses affirming the site's sanctity, with one plaque in raised for contrast. In the , adaptations of Thuluth appear in inlaid black marble on white surfaces, featuring verses from Surahs like Yaseen and on themes of divine judgment and mercy, signed by calligrapher Amanat Khan Shirazi and dated 1646 CE. The in displays massive Thuluth roundels on wooden panels, inscribed by master calligrapher Izzet Efendi during the 19th century, bearing the names of , Prophet Muhammad, and the Caliphs to assert Islamic identity. At Topkapi Palace, Thuluth inscriptions on gates and domes, such as at the Imperial Door, proclaim core Islamic declarations like the , crafted by calligraphers including Ali bin Yahya Sofi to blend piety with imperial authority.

Manuscripts, Texts, and Decorative Arts

In Islamic manuscripts, particularly Qur'ans, Thuluth script primarily served decorative functions such as headings, titles, and illuminated panels rather than full textual transcription, owing to its elaborate forms that prioritized aesthetics over legibility. For instance, 13th-century folios attributed to the master calligrapher Yaqut al-Musta'simi (d. 1298) feature Thuluth in gold-outlined panels for sura titles, enhancing the sacred text's while the body was rendered in more readable scripts like Naskh. Full Qur'anic texts in Thuluth were rare, as the script's sweeping curves and proportional complexity made it less suitable for continuous reading, limiting its use to ornamental elements that evoked divine elegance. Beyond manuscripts, Thuluth adorned portable decorative objects, including tombstones, where it inscribed epitaphs and invocations during the period (13th–16th centuries), often carved in stone to convey solemnity and artistry. On enameled glassware, such as mosque lamps from 14th-century , Thuluth inscriptions in gold and polychrome enamels encircled the vessels, quoting Qur'anic verses like the to symbolize spiritual illumination. Book covers and bindings also incorporated Thuluth, stamped or tooled in gold on leather to denote titles or pious dedications, as seen in 15th-century Qur'an cases. In Persian miniatures, Thuluth integrated seamlessly with arabesque motifs, framing illuminated pages with gold floral borders around chapter headings, as in 15th-century Timurid manuscripts where the script's fluidity complemented intricate vegetal patterns. Thuluth's application on everyday objects extended to ceramics, where 10th-century earthenware bowls from featured early Islamic scripts like in white slip under transparent glazes, blending textual blessings with functional . These decorative uses employed finer scales than monumental inscriptions, adapting the script's bold proportions for intimate surfaces. Techniques involved for luminous accents, applied via on or , and colored inks—such as red, blue, and black with diacritical marks—to heighten contrast and vibrancy in illuminated panels. This meticulous process, using reed pens and layered pigments, ensured Thuluth's ornamental barbed heads and elongated strokes retained their rhythmic grace on diminutive formats.

Modern and Revival Contexts

In the , following the decline of patronage after , Thuluth calligraphy experienced a revival through institutional efforts in , where masters like Hasan Çelebi (1935–2025) trained nearly 100 students worldwide, preserving and adapting the script's traditional proportions for contemporary practice. Turkish cultural institutes, such as the , have organized courses in regions like to revivify Thuluth, emphasizing its roots and fluid forms amid post-war cultural reclamation. In Arab contexts, revival movements gained momentum through cultural festivals, including the UAE's Forum for Quran , which in recent years featured 30 calligraphers from 16 countries producing works in Thuluth script to promote its spiritual and aesthetic legacy. Similar initiatives, such as the International Festival in and the Kirkuk Festival in , have focused on workshops reviving Thuluth alongside other styles, fostering intergenerational transmission. Digital fonts have played a key role in this revival, enabling Thuluth's proportions to be preserved in modern branding, particularly in the UAE, where scripts like those for "United Arab Emirates" and "Abu Dhabi" are rendered in Thuluth for logos and official emblems, blending heritage with national identity. Platforms such as Kaleam, developed in Saudi Arabia and launched in 2019, support Thuluth among other styles, allowing users to generate personalized digital fonts that mimic hand-drawn fluidity for design and 3D printing applications. Contemporary applications of Thuluth extend to public installations and graphic design, as seen in Dubai's , where large-scale incisions form structural elements, incorporating Thuluth-inspired curves for architectural impact. In the UAE, Thuluth appears in urban murals and fashion, with artists creating site-specific works that integrate the script into and textile patterns, enhancing cultural visibility in cosmopolitan settings. Hybrid forms blending Thuluth with have emerged in , where contemporary creators deconstruct its elongated strokes into geometric and expressive compositions for gallery and public displays. Adapting Thuluth to print and digital media presents challenges due to the script's cursive connectivity and contextual forms, requiring over 500 glyphs per font to maintain aesthetic harmony, unlike simpler Latin-based systems. Innovations like digital typesetting since the 1990s have addressed this by reducing glyph complexity while drawing from Thuluth's proportional principles, enabling scalable designs without losing fluidity. Global exhibitions since 2000, such as the 2019 "Evolution Stages of Arabic Calligraphy" at Sharjah Calligraphy Museum featuring over 40 Thuluth works and the 2022 Dubai exhibition of 100+ Arabic calligraphy pieces, have highlighted this cross-cultural appeal, showcasing adaptations in canvas, digital, and mixed media. Events like Wissam Shawkat's 2024 "Calligraformism" in Dubai further demonstrate Thuluth's innovative fusion with abstraction, underscoring its enduring relevance in international art discourse. Following Hasan Çelebi's death in February 2025, tributes and exhibitions, such as those organized by Turkish calligraphy associations, have emphasized his influence on Thuluth preservation as of November 2025.

Direct Derivatives

Jali Thuluth represents an ornamental variant of the Thuluth script, characterized by broader pen strokes and intricate extensions that evoke floral motifs, enhancing its decorative appeal for monumental applications. This style emerged in the late 15th century during the early Ottoman period, building on Thuluth's cursive foundation to create larger, more legible forms suitable for architectural inscriptions and tiles, such as those adorning interiors. Its profuse embellishments, attributed to calligraphers like Hafiz Osman in the , allowed for greater visual impact in public spaces while preserving Thuluth's proportional elegance. Muhaqqaq is a related within the six proportional styles, sharing Thuluth's foundational proportions with a thicker, bolder form, amplified curves, and a pronounced vertical emphasis that retains the characteristic one-third slope. Codified in the during the Abbasid era, with significant development under patronage from century, it evolved through structural simplifications for improved clarity and fluency, distinguishing it from Thuluth's more ornamental fluidity while sharing visual and proportional similarities. In Quranic manuscripts, often complemented Thuluth, with the former handling main body text for its readability and the latter reserved for headings. Rayhani is one of the six proportional scripts codified by Ibn Muqlah, often considered a refined variant influenced by Thuluth and proportions, featuring delicate, leaf-like forms that reduce the scale for finer, more intricate applications in religious and administrative texts. Emerging in the Abbasid era, it incorporates Thuluth-inspired features like refined curves into a smaller, -like aesthetic named for its sweet, herbaceous delicacy (rayhan meaning ). This evolutionary modification emphasized precision and lightness, making Rayhani ideal as a companion to bolder scripts in paired layouts.

Comparisons to Other Calligraphic Styles

Thuluth script distinguishes itself from through its emphasis on curved and oblique lines, contrasting Kufic's rigid angular and geometric forms that prioritize bold, square proportions for structural durability. While dominated , inscriptions, and coinage from the 7th to 10th centuries due to its clarity and monumental presence, Thuluth emerged as a more fluid, decorative alternative, assuming Kufic's role in grand architectural by the 11th century, particularly in non-Quranic contexts like tombstones and ceramics. In comparison to Naskh, Thuluth prioritizes ornamental largeness and expansive spacing for visual impact, whereas Naskh focuses on compact, rounded forms optimized for readability and swift execution in everyday texts such as books and official documents. Thuluth's sweeping curves demand complex proportional systems, making it suitable for headings and titles, while Naskh serves as its practical companion, often paired with Thuluth in composite works to balance with . Thuluth's measured elegance sets it apart from Diwani, which features intricate flourishes, intertwining letters, and a highly flow that renders it more ornamental yet less decipherable. Both styles flourished under , with Thuluth providing a foundational base from the Umayyad era onward, while Diwani evolved in the 16th–17th centuries specifically for imperial decrees, incorporating Thuluth elements but amplifying decorative complexity for artistic rather than functional primacy.

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