In 1373, following three unsuccessful raids of the Grand Duke of Lithuania Algirdas against Muscovy as part of the Lithuanian–Muscovite War and the schism of Metropolitan of Kiev on Muscovite and Litvin parts (the schism started in 1316 and has taken particularly threatening forms in the beginning of the 1350s). Cyprian was sent by the Patriarch as "trustee" (envoy) to the Lithuanian and Muscovite Russias with the goal to reconcile Litvin and Tverite princes with de facto Muscovite Metropolitan Alexius and prevent total division of the Church politically between Wilno and Moscow. Perhaps, in winter of the same year Cyprian visited Kiev for the first time along with other cities of the Grand Duchy of Lithuania. On 9 March 1374 he visited Tver on consecration of the bishop of Tver Euthymius and later along with Metropolitan Alexius left for Pereslavl-Zalessky. To Constantinople Cyprian returned from the Grand Duchy of Lithuania carrying with him a letter from Orthodox Christian Lithuanian-Ruthenian (Russian) with a request to the patriarch to consecrate him as the Metropolitan of Lithuania.