The first mention of the language as the "Bulgarian language" instead of the "Slavonic language" comes in the work of the Greek clergy of the Archbishopric of Ohrid in the 11th century, for example in the Greek hagiography of Clement of Ohrid by Theophylact of Ohrid (late 11th century).

А в български извори кога се споменава за първи път?

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Слава Україні!