The Lithuanians invaded the Kingdom of Galicia–Volhynia in late August 1350. They captured significant territories, which were distributed among the Lithuanian princes. The towns of Chełm and Vladimir were given to one George who was probably identical with George Koriatovich, according to Knoll. Casimir III of Poland acknowledged the rule of the Lithuanian princes, including George, in the lands that they had occupied in a treaty signed in 1352. George and his brother, Alexander, came into conflict with their uncles, Kęstutis and Liubartas, in the early 1360s. George and Alexander were expelled from their lands around 1362. They fled to Poland where they settled in Casimir III's court.
