Cyprian, Metropolitan of Kiev

Cyprian was a prelate of Bulgarian origin, who served as the Metropolitan of Kiev, Rus' and Lithuania and the Metropolitan of Kiev and all Rus' in the Ecumenical Patriarchate of Constantinople. During both periods, he was opposed by rival hierarchs and by the grand prince of Moscow. He was known as a bright opinion writer, editor, translator, and book copyist. He is commemorated by the Russian Orthodox Church on May 27 and September 16 (O.S.).