Historical figure John the Exarch

John the Exarch (Їѡаннъ Єѯархъ in Old Bulgarian) was a prominent medieval Bulgarian writer and translator whose life and career remain largely obscure. He was a leading representative of the Preslav Literary School in the late ninth and early tenth centuries.

Very little is known about him. He is thought to have studied in Constantinople, possibly alongside the future Bulgarian ruler Simeon. The designation 'Exarch' may not indicate a bishop, as some scholars suggest, but rather a title associated with his intellectual authority.

His literary work included translations from Greek into Old Bulgarian and original compositions. Around 893, he translated part of John of Damascus's work as Heaven. His Hexaemeron combined translations of Byzantine authors with original passages, including some of the earliest Slavic texts on medicine and astronomy. Several sermons survive under the name John the Presbyter, whom many identify with John the Exarch.

Despite the limited evidence, he remains an important figure in medieval Bulgarian history and culture and a pioneer of its literary tradition.