During his sojourn in Serbia he wrote a biography ofStephen Uroš III, a hymn for the church service honoringStefan of Dečani, and a report on the transfer of the remnants ofSaint Paraskeva to Serbia, for which he also rewrote the service.[2]
In 1414, Grand DukeVytautas attempted to re-establish the Metropolis of Lithuania. He arranged for a synod of bishops to elect Gregory as the Metropolitan of Lithuania.[3] The consecration took place without the consent of PatriarchEuthymius II of Constantinople who deposed and anathematized him and who confirmed the same in letters to Metropolitan Photius of Kiev, EmperorManuel II Palaeologos and Grand Prince Vasily I. After Gregory’s death in the winter of 1419–1420, Photius made peace with Vytautas. As a result, the entire Metropolis of Kiev and all Rus', including Halych, was unified under Photius until his death in 1431.[4]
The rivalry betweenVilnius and Moscow effectively ended in 1448 when Moscow began selecting the metropolitans independently without approval from the Ecumenical Patriachate, which collapsed in 1453.[5][4]
