Cyprian (Bulgarian: Киприан, Russian: Киприан, Ukrainian: Кипріан) (c. 1336 – 16 September 1406) was Metropolitan of Kiev and All Rus' with the Metropolitan's residence in Moscow. (The official title was Metropolitan of Kiev and All Rus' until 1448, even though the metropolitans were in Vladimir-on-Kliazma and later Moscow since 1299.) He is commemorated on September 16. The Book of Degrees (Stepénnaya kniga), which grouped Russian monarchs in the order of their generations, was started by Cyprian in 1390 but was completed in 1563.
Cyprian was a clergyman of Bulgarian antecedents who lived for some time at Mount Athos, becoming a Hesychast. Because of his devout lifestyle and excellent education, in 1373, Philotheus Kokkinos of Constantinople sent him to Lithuania and Muscovy on a mission to reconcile the princes of Lithuania and Tver with Metropolitan Alexius.
When, in 1375, hostilities between Moscow and Lithuania began again, the Lithuanian princes, led by Grand Duke Algirdas asked Philotheus I to appoint Cyprian their Metropolitan. At the Constantinople Council it was decided to avoid a fragmentation of the Russian metropolia, and that “upon the death of Alexis, Cyprian should become the Metropolitan of All Rus.” Philotheus consecrated Cyprian Metropolitan of Kiev and Lithuania in order to unite both ecclesiastical provinces after the death of Alexius. Because this ordination was not recognized by Moscow, he became the metropolitan of “all Rus’” only in 1389. He resided thereafter in Moscow, although he visited Kiev and other Ukrainian eparchies.