Boris I, also called Saint Tsar Boris I or Saint Tsar Boris Mikhail I, baptismal name Mikhail, or English Michael, khan of Bulgaria (852–889), whose long reign witnessed the conversion of the Bulgarians to Christianity, the founding of an autocephalous Bulgarian church, and the advent of Slavonic literature and establishment of the first centres of Slav-Bulgarian scholarship and education. Boris active domestic and foreign diplomacy was of great importance in the formation of a united Bulgarian ethnic community, and it left lasting traces on Bulgaria’s subsequent development.
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