Gregory Tsamblak

Gregory Tsamblak (Bulgarian: Григорий Цамблак; Greek: Γκρέγκορι Τζαμπλάκων; Romanian: Grigorie Țamblac; Serbian Cyrillic: Григорије Цамблак; Ukrainian: Григорій Цамблак; c. 1365 – c. 1420), member of the Tzamplakon family, was a writer and cleric active in Bulgaria, Moldavia, Serbia, Grand Duchy of Lithuania, and the Principality of Kiev.

[1] During his sojourn in Serbia he wrote a biography of Stephen Uroš III, a hymn for the church service honoring Stefan of Dečani, and a report on the transfer of the remnants of Saint Paraskeva to Serbia, for which he also rewrote the service.

He arranged for a synod of bishops to elect Gregory as the Metropolitan of Lithuania.

[3] The consecration took place without the consent of Patriarch Euthymius II of Constantinople who deposed and anathematized him and who confirmed the same in letters to Metropolitan Photius of Kiev, Emperor Manuel II Palaeologos and Grand Prince Vasily I.

As a result, the entire Metropolis of Kiev and all Rus', including Halych, was unified under Photius until his death in 1431.