George closely cooperated with Casimir III of Poland against his Lithuanian kinsmen who had absorbed parts of the Kingdom of Galicia–Volhynia.
[1] Karijotas inherited Novgorodok (now Navahrudak in Belarus) from his father, Gediminas, Grand Duke of Lithuania, in late 1341 or early 1342.
[7] 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.
[12] According to analyze of other historians[13] these source mistaken two different events and Vytautas (not Algirdas) defeated these three princes in 1390s and the battle had no connection with Koriatovichs ruling in Podolia.
[17][19] Bogdan Petriceicu Hasdeu published, in 1860, a charter, issued on 3 June 1374, which narrated that "the Lithuanian prince, [George Koriatovich], hospodar of the whole of Moldavia" bestowed a village upon his representative in Maurocastro (Bilhorod-Dnistrovskyi in Ukraine) for the latter's courage in a battle against the Tatars by the Dniester River.
[21] Victor Spinei writes that George must have died before his brother, Alexander, confirmed his donation to the Smotrych Monastery on 17 March 1375.
[20] Deletant says that George was only murdered shortly before the Lithuanians invaded Moldavia in late 1377, because that invasion was most probably an act of vengeance.