| Accordingly, when Bulgaria was converted to Christianity after 865 , bringing massive Slavic-speaking populations within the pale of Christendom, a new literary language, Old Church Slavonic, directly based upon Bulgarian speech, developed for their use | Roisman, Joseph; Worthington, Ian 2011 |
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| World classics and modern foreign dramas are typically produced, as well as both modern and traditional Bulgarian plays, including those by Ivan Vazov and poet Peyo Yavorov | A Concise History of Bulgaria 2005 Cambridge, UK; New York: Cambridge University Press• And it was mainly from Bulgaria that a rich supply of literary monuments was transferred to Kiev and other centres |
The power of the Thracians had been reduced by the Macedonians, and now much of the area fell into Celtic hands.
30| National Statistical Institute of Bulgaria | At the beginning of the 10th century a new alphabet — the Cyrillic alphabet — was developed on the basis of Greek and Glagolitic cursive at the Preslav Literary School |
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| "Foreign Affairs in the 1960s and 1970s" | "The Political Atmosphere in the 1970s" |