{"id":29953,"date":"2026-10-03T15:33:47","date_gmt":"2026-10-03T14:33:47","guid":{"rendered":"https:\/\/www.earth-site.co.uk\/Education\/the-cyrillic-alphabet-and-its-connection-to-medieval-bulgaria\/"},"modified":"2026-10-03T16:02:31","modified_gmt":"2026-10-03T15:02:31","slug":"the-cyrillic-alphabet-and-its-connection-to-medieval-bulgaria","status":"publish","type":"post","link":"https:\/\/www.earth-site.co.uk\/Education\/the-cyrillic-alphabet-and-its-connection-to-medieval-bulgaria\/","title":{"rendered":"The Cyrillic Alphabet and Its Connection to Medieval Bulgaria"},"content":{"rendered":"<p>The <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-armenian-language-and-the-creation-of-its-unique-alphabet\/\" title=\"The Armenian Language and the Creation of Its Unique Alphabet\">Cyrillic alphabet<\/a>, the writing system used for numerous Slavic languages today, actually has deep roots in Medieval Bulgaria. While often associated with Russia, its origins trace back to the First Bulgarian Empire, where it was developed and formalised, playing a pivotal role in the region&#8217;s cultural and spiritual development. It wasn&#8217;t simply an administrative tool; it was a cornerstone of a burgeoning literary tradition and a powerful symbol of national identity during a crucial period in European history.<\/p>\n<h2>The Genesis of a Script: Glagolitic to Cyrillic<\/h2>\n<p>The story of the Cyrillic alphabet can&#8217;t be told without first acknowledging its precursor: Glagolitic. This earlier script was intricately linked to the missionary work of <a href=\"https:\/\/www.earth-site.co.uk\/Education\/saints-cyril-and-methodius-and-the-christianisation-of-the-slavs\/\" title=\"Saints Cyril and Methodius and the Christianisation of the Slavs\">Saints Cyril<\/a> and Methodius, brothers who profoundly influenced the Slavic world.<\/p>\n<h3>Cyril and Methodius: Missionaries and Innovators<\/h3>\n<p>Around the 9th century, the <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-byzantine-empire\/\" title=\"The Byzantine Empire\">Byzantine Emperor Michael III dispatched<\/a> two brothers, Constantine (later known as Cyril) and Methodius, from Thessaloniki to Great Moravia. Their mission was to evangelise the Slavic populations there using their native language, rather than Latin or Greek, which were the dominant liturgical languages of the time. This was a radical idea and required a new writing system, as the existing alphabets weren&#8217;t suitable for accurately representing the nuances of Slavic phonetics.<\/p>\n<p>Constantine, a brilliant scholar and linguist, is credited with creating the first Slavic alphabet, now known as Glagolitic. This script was remarkably complex, with each letter designed to represent a specific sound in Old Church Slavonic, the language they were standardising for liturgical use. The motivation behind Glagolitic was primarily religious: to translate biblical texts and conduct church services in a language accessible to the Slavic people, thereby fostering a stronger connection to Christianity.<\/p>\n<h3>The Rise of Glagolitic and Its Challenges<\/h3>\n<p>Glagolitic was embraced in Great Moravia for a time, facilitating the spread of Christianity and literacy. However, its complex nature and the political machinations of the Latin-speaking clergy eventually led to its decline in that region. After Methodius&#8217;s death, his disciples faced persecution and were expelled from Great Moravia. This expulsion, while a setback for the mission in Moravia, proved to be a critical turning point for the future of Slavic literacy and the development of Cyrillic. Many of these expelled scholars found refuge in the First Bulgarian Empire.<\/p>\n<h3>The Bulgarian Connection: Adoption and Refinement<\/h3>\n<p>Upon their arrival in Bulgaria, particularly under the reign of <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-story-of-boris-i-the-man-who-tried-to-become-king-of-andorra\/\" title=\"The Story of Boris I: The Man Who Tried to Become King of Andorra\">Prince Boris<\/a> I and later Tsar Symeon I, these disciples were welcomed with open arms. Bulgaria had recently converted to Christianity and was actively seeking ways to solidify its new faith and establish its own distinct cultural identity, separate from both Byzantium and the Latin West. The Bulgarian rulers saw the potential of a Slavic script as a powerful tool for achieving these goals.<\/p>\n<p>It was in Bulgaria, at literary centres such as the Preslav Literary School and the Ohrid Literary School, that Glagolitic underwent a significant transformation. While Glagolitic continued to be used for a period, particularly in some regions, a new, more streamlined script emerged: Cyrillic.<\/p>\n<h2>Why Bulgaria Was the Crucible for Cyrillic<\/h2>\n<p>The decision to adopt and refine a Slavic script in Bulgaria was not arbitrary. Several factors converged to make the First Bulgarian Empire the ideal environment for the birth and flourishing of Cyrillic.<\/p>\n<h3>Political and Religious Imperatives<\/h3>\n<p>Following its conversion to Christianity in 864, Bulgaria was in a <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-role-of-geography-in-wars-and-conflicts\/\" title=\"The Role of Geography in Wars and Conflicts\">delicate geopolitical position<\/a>. It was caught between the spheres of influence of the Byzantine Empire to the east and the Frankish Empire (and later the Holy Roman Empire) to the west, both of which used different liturgical languages (Greek and Latin, respectively). Prince Boris I initially explored alliances with both, but ultimately opted for the Eastern Orthodox Church. However, he was determined to establish an independent Bulgarian church with its own liturgy and clergy, free from direct Byzantine control.<\/p>\n<p>A distinct Slavic script and language for worship and administration were crucial for this independence. It allowed Bulgaria to develop its own theological discourse, educate its own clergy, and foster a sense of national unity and cultural distinctiveness. Adopting a pre-existing or developing a new script based on Slavic sounds was a strategic move to assert sovereignty.<\/p>\n<h3>The Role of Literary Schools<\/h3>\n<p>The establishment of literary schools, notably the Preslav Literary School and the Ohrid Literary School, was instrumental in this process. These institutions became vibrant centres of scholarship, translation, and original literary creation.<\/p>\n<h4>The Preslav Literary School<\/h4>\n<p>Located in the then-capital city of Preslav, this school became the intellectual heart of the First Bulgarian Empire. It attracted scholars, scribes, and translators from across the <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-complete-history-of-belarus-explained\/\" title=\"The Complete History of Belarus Explained\">Slavic world<\/a>, including the disciples of Cyril and Methodius. Under the patronage of Tsar Symeon I, known as the &#8220;Golden Age&#8221; of Bulgarian culture, the Preslav School focused on translating a vast body of Greek theological and philosophical works into Old Church Slavonic. It was here that Cyrillic was largely formalised, likely drawing heavily from the uncial Greek alphabet, making it easier to learn and write than Glagolitic, especially for those familiar with Greek letters. This simplification was a practical decision, aiming for wider adoption and faster dissemination of literacy.<\/p>\n<h4>The Ohrid Literary School<\/h4>\n<p>Located in Ohrid (<a href=\"https:\/\/www.earth-site.co.uk\/Education\/north-macedonia\/\" title=\"North Macedonia\">present-day North Macedonia<\/a>), this school was founded by Clement of Ohrid, one of Cyril and Methodius&#8217;s most prominent disciples. While the Preslav School is often credited with the formalisation of Cyrillic, the Ohrid School played a crucial role in its dissemination and practical application. Clement and his followers taught thousands of students, expanding literacy and the use of the new script throughout the Bulgarian Empire&#8217;s western territories. They continued to translate religious texts and composed original works, further solidifying Old Church Slavonic as a literary language and Cyrillic as its primary medium.<\/p>\n<h3>The Golden Age of Tsar Symeon I<\/h3>\n<p>Tsar Symeon I (reigned 893-927) was a pivotal figure in the development and adoption of Cyrillic. A highly <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-complete-history-of-bhutans-kings\/\" title=\"The Complete History of Bhutan's Kings\">educated ruler<\/a> who had studied in Constantinople, he understood the power of culture and learning. He actively promoted the development of a distinct Bulgarian literary tradition, seeing it as integral to strengthening the Bulgarian state. Under his patronage, the Preslav Literary School flourished, producing a wealth of original works and translations, all written in Old Church Slavonic using the newly formalised Cyrillic alphabet. This period is often referred to as the &#8220;Golden Age of Bulgarian Culture,&#8221; largely due to the literary output and the widespread adoption of Cyrillic.<\/p>\n<h2>The Structure and Features of Early Cyrillic<\/h2>\n<p>Early Cyrillic, as formalised in Bulgaria, was a clever synthesis that leveraged existing alphabetic traditions while adapting them to <a href=\"https:\/\/www.earth-site.co.uk\/Education\/the-history-of-belarusian-nationalism\/\" title=\"The History of Belarusian Nationalism\">Slavic phonetics<\/a>. Its design made it both practical and symbolically powerful.<\/p>\n<h3>Borrowing from Greek, Adapting for Slavonic<\/h3>\n<p>The developers of Cyrillic largely based its letter forms on the Greek uncial script, which was familiar to many literate individuals in the region due to Byzantine cultural influence. This made Cyrillic relatively easy for those already acquainted with Greek to learn and write, a significant advantage over the more visually distinct Glagolitic.<\/p>\n<p>However, simply borrowing Greek letters wouldn&#8217;t suffice for the rich soundscape of Old Church Slavonic. The Greek alphabet lacked symbols for several distinctly Slavic sounds, such as those represented by &#8216;\u0436&#8217; (zh), &#8216;\u0447&#8217; (ch), &#8216;\u0448&#8217; (sh), &#8216;\u0449&#8217; (sht), &#8216;\u044a&#8217; (jer), &#8216;\u044c&#8217; (jer), &#8216;\u0463&#8217; (yat), and &#8216;\u044e&#8217; (yu). To address this, the creators of Cyrillic ingeniously incorporated some letters directly from Glagolitic or created new letters based on Glagolitic forms for these specific Slavic sounds. This hybrid approach \u2013 primarily Greek in appearance but with crucial Slavic additions \u2013 was the genius of Cyrillic.<\/p>\n<h3>Key Characteristics of the Early Script<\/h3>\n<p>Early <a href=\"https:\/\/www.earth-site.co.uk\/Education\/russia\/\" title=\"Russia\">Cyrillic consisted<\/a> of around 44 letters. It included letters for all the sounds in Old Church Slavonic, making it a highly phonetic alphabet. Unlike later reforms, early Cyrillic often had duplicate letters for certain sounds (e.g., different forms of &#8216;i&#8217; or &#8216;o&#8217;) reflecting Greek orthographic conventions, though these would later be simplified. It also included letters like &#8216;\u0462&#8217; (yat) and the jers (&#8216;\u044a&#8217; and &#8216;\u044c&#8217;), which represented specific vocalic nuances that have since evolved or disappeared in many modern Slavic languages. The script was designed to be clear and legible, facilitating the copying of manuscripts and the teaching of literacy.<\/p>\n<h3>Distinguishing from Glagolitic<\/h3>\n<p>The primary distinction between Cyrillic and Glagolitic lay in their visual appearance and complexity. Glagolitic letters were highly ornamental, often angular or curved, and lacked a direct resemblance to any other known alphabet. This made it unique but also more challenging to write quickly and consistently. Cyrillic, by contrast, with its strong Greek influence, was much simpler in form, more uniform, and therefore easier to learn and reproduce. This practicality was a key factor in its rapid adoption and eventual widespread success. While Glagolitic persisted in some liturgical contexts, particularly in Croatia (Glagolitic Mass), Cyrillic quickly became the dominant script for Slavic languages.<\/p>\n<h2>The Enduring Legacy and Spread of Cyrillic<\/h2>\n<p>From its Bulgarian cradle, Cyrillic embarked on a journey that would see it adopted by a vast swathe of Eastern Europe and beyond, shaping the cultural and linguistic landscapes of numerous nations.<\/p>\n<h3>Expansion to Other Slavic Lands<\/h3>\n<p>The success of Cyrillic in Bulgaria meant that it was perfectly positioned to spread to other Slavic-speaking regions. As Bulgaria&#8217;s political and cultural influence grew, so too did the reach of its script.<\/p>\n<h4>Rus&#8217; (Kievan Rus&#8217;)<\/h4>\n<p>Perhaps the most significant expansion of Cyrillic occurred with the Christianisation of Kievan Rus&#8217; (the precursor to modern Russia, Ukraine, and Belarus) in the late 10th century. Prince Vladimir the Great, after converting to Orthodox Christianity, brought priests, books, and the Cyrillic alphabet from Bulgaria. The Bulgarian Orthodox Church, being autocephalous (self-governing) and using Old Church Slavonic, served as a model for the nascent Russian church. Cyrillic quickly became the official script for religious texts, administration, and eventually all forms of writing in Rus&#8217;. This was a monumental moment for the alphabet&#8217;s future, as it firmly established Cyrillic as the script of the powerful and expanding Russian state.<\/p>\n<h4>Serbia and Other South Slavs<\/h4>\n<p>Cyrillic also spread to other South Slavic lands, particularly Serbia. During the medieval period, the Serbian state was deeply influenced by both Byzantine and Bulgarian culture. Cyrillic was adopted early on for religious, administrative, and literary purposes, becoming the standard script for the Serbian language. Similarly, it made its way into other regions with Orthodox Christian populations, solidifying its place as the script of the Eastern Orthodox Slavs.<\/p>\n<h3>Cyrillic and Orthodoxy<\/h3>\n<p>The connection between Cyrillic and Orthodox Christianity is profound and enduring. By providing a script for translating religious texts into a comprehensible language, Cyrillic became inextricably linked with the faith itself. It facilitated the establishment of independent Orthodox churches among the Slavs, fostering distinct spiritual and cultural identities that diverged from the Latin West. For centuries, where Orthodoxy went, Cyrillic often followed. This religious association gave the alphabet immense cultural weight and ensured its preservation and evolution.<\/p>\n<h3>Modern Cyrillic and Its Variations<\/h3>\n<p>Over the centuries, Cyrillic has undergone numerous reforms and adaptations to suit the phonetics and orthographic needs of different languages. The most significant reform occurred in Russia under Peter the Great in the early 18th century, which simplified many letters and made them more similar to Latin forms, aiming for a more modern and secular script for administrative and scientific texts. This version, known as the Civil Script (Grazhdanka), is the basis for most modern Cyrillic alphabets.<\/p>\n<p>Today, Cyrillic is used to write over 50 languages, predominantly in Eastern Europe and Asia. While the fundamental structure remains, there are distinct variations:<\/p>\n<ul>\n<li><strong>Russian Cyrillic:<\/strong> The most widely known form, with 33 letters.<\/li>\n<li><strong>Ukrainian Cyrillic:<\/strong> Includes unique letters like &#8216;\u0491&#8217; and &#8216;\u0457&#8217;.<\/li>\n<li><strong>Serbian Cyrillic:<\/strong> Features specific letters for sounds like &#8216;\u0452&#8217; and &#8216;\u045f&#8217; and a one-to-one correspondence between letters and sounds (Vuk Karad\u017ei\u0107&#8217;s reform).<\/li>\n<li><strong>Bulgarian Cyrillic:<\/strong> Retains some older forms and has a specific set of letters.<\/li>\n<li><strong>Macedonian Cyrillic:<\/strong> Similar to Serbian, with distinct letters like &#8216;\u0455&#8217; and &#8216;\u045c&#8217;.<\/li>\n<li><strong>Non-Slavic Cyrillic:<\/strong> Many languages in the former Soviet Union, such as Kazakh, Kyrgyz, Uzbek (though some are transitioning to Latin), and Mongolian, also adopted Cyrillic, often with additional diacritics or new letter forms to represent sounds not found in Slavic languages.<\/li>\n<\/ul>\n<p>These variations underscore the alphabet&#8217;s adaptability and its continued relevance as a living, evolving script.<\/p>\n<h2>The Enduring Symbolism of Cyrillic for Bulgaria<\/h2>\n<p><?xml encoding=\"UTF-8\"><\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\" style=\"width:100%;border-collapse:collapse;border:2px solid #f2f2f2\">\n<thead>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<th style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Aspect<\/th>\n<th style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Details<\/th>\n<th style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Significance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Origin<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Developed in the First Bulgarian Empire during the 9th century<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Foundation for Slavic literacy and cultural identity<\/td>\n<\/tr>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Creators<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Saints Cyril and Methodius (Glagolitic script), with Cyrillic developed by their disciples in Bulgaria<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Adapted to Slavic phonetics, facilitating widespread literacy<\/td>\n<\/tr>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Initial Use<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Religious texts and administration in medieval Bulgaria<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Unified Slavic-speaking peoples under a common script<\/td>\n<\/tr>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Alphabet Composition<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Originally 43 letters, combining Greek uncial letters and Glagolitic characters<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Reflects linguistic and cultural synthesis<\/td>\n<\/tr>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Spread<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Adopted by other Slavic nations such as Serbia, Russia, and Ukraine<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Instrumental in the cultural development of Eastern Europe<\/td>\n<\/tr>\n<tr style=\"display:table-row;vertical-align:inherit;border-color:inherit;line-height:40px\">\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Modern Usage<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Basis for alphabets in over 50 languages, including Russian, Bulgarian, Serbian<\/td>\n<td style=\"padding:12px;text-align:left;border-bottom:1px solid #e5e7eb;line-height:40px\">Continues to influence language, literature, and identity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For Bulgaria, the Cyrillic alphabet is far more than just a writing system; it is a profound symbol of national identity, cultural heritage, and historical achievement.<\/p>\n<h3>A Cornerstone of National Identity<\/h3>\n<p>In Bulgaria, Cyrillic is seen as one of the most significant contributions to world culture. It was conceived, developed, and disseminated from Bulgarian soil, cementing the nation&#8217;s place as a cultural powerhouse during the medieval period. This historical fact is a source of immense pride, distinguishing Bulgaria from its neighbours and affirming its distinct historical trajectory. The alphabet is taught from a young age as a fundamental aspect of Bulgarian heritage, connecting modern Bulgarians directly to their medieval past and the &#8220;Golden Age&#8221; of Tsar Symeon I.<\/p>\n<h3>Bulgaria&#8217;s Gift to the Slavic World<\/h3>\n<p>Bulgarians often refer to Cyrillic as &#8220;their gift&#8221; to the Slavic world. While Cyril and Methodius laid the groundwork, it was in Bulgaria that their legacy was preserved, expanded, and given its enduring form. Without the safe haven and active patronage provided by the First Bulgarian Empire, the Slavic literary tradition might have taken a very different path, potentially remaining fragmented or largely overshadowed by Greek or Latin. The development of Cyrillic allowed for the independent spiritual and cultural development of numerous Slavic nations, and Bulgaria proudly claims its role in facilitating this.<\/p>\n<h3>Commemoration and Cultural Significance<\/h3>\n<p>The importance of Cyrillic is celebrated annually in Bulgaria on 24 May, the Day of Slavic Alphabet, Bulgarian Enlightenment, and Culture. This national holiday commemorates Saints Cyril and Methodius, their disciples, and the creation of the Slavic alphabet. It&#8217;s a day of parades, cultural events, and academic celebrations, underscoring the deep veneration for the script and its creators. Educational institutions, from kindergartens to universities, participate, reinforcing the idea that literacy, education, and cultural identity are inextricably linked to Cyrillic.<\/p>\n<p>Even in contemporary Bulgaria, the Cyrillic script continues to evolve, reflecting modern linguistic needs while maintaining its historical connection. It stands as a testament to the intellectual prowess of medieval Bulgarian scholars and rulers, a lasting legacy that has shaped not only the Bulgarian nation but also the cultural and linguistic fabric of much of Eastern Europe and beyond. The unassuming letter forms on your screen carry a rich history, deeply entwined with the ambitions and achievements of the First Bulgarian Empire.<\/p>\n<p><\/p>\n<h2>FAQs<\/h2>\n<p><\/p>\n<h3>What is the Cyrillic alphabet?<\/h3>\n<p>The Cyrillic alphabet is a writing system used for various languages across Eastern Europe and Asia. It was developed in the 9th century by the brothers Cyril and Methodius, two Byzantine Christian theologians, and missionaries.<\/p>\n<h3>How is the Cyrillic alphabet connected to Medieval Bulgaria?<\/h3>\n<p>The Cyrillic alphabet was introduced to Medieval Bulgaria in the 9th century by the disciples of Cyril and Methodius. It became the official script of the Bulgarian Empire and played a significant role in the cultural and religious development of the region.<\/p>\n<h3>Was the Cyrillic alphabet specifically created for the Bulgarian language?<\/h3>\n<p>No, the Cyrillic alphabet was originally created to translate religious texts into the Slavic languages spoken in the region. Over time, it was adapted and modified to suit the specific phonetic needs of different languages, including Bulgarian.<\/p>\n<h3>How did the Cyrillic alphabet impact literacy in Medieval Bulgaria?<\/h3>\n<p>The introduction of the Cyrillic alphabet played a crucial role in the spread of literacy and education in Medieval Bulgaria. It enabled the translation of religious texts, the development of a rich literary tradition, and the preservation of Bulgarian cultural identity.<\/p>\n<h3>Is the Cyrillic alphabet still used in Bulgaria today?<\/h3>\n<p>Yes, the Cyrillic alphabet is still used as the official script in Bulgaria today. It is also used in several other countries, including Russia, Ukraine, Serbia, and Belarus, among others.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Cyrillic alphabet, the writing system used for numerous Slavic languages today, actually has deep roots in Medieval Bulgaria. 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