Cyprian, Metropolitan of Moscow (b. 1336)
Cyprian (Bulgarian: Киприан, Russian: Киприан, Ukrainian: Кипріан) (c. 1336 – 16 September 1406) was a hierarch and bishop of the Ecumenical Patriarchate of Constantinople, bright opinion writer, editor, translator, and book copyist. He is best known as Metropolitan of Kiev and All Rus' with the Metropolitan see in Moscow. He is commemorated by the Russian Orthodox Church on May 27 and September 16 (by the Old style).