Claim: Vuk Kosača (1317-1359) was in the Kosača ( medieval noble family which ruled over parts of modern-day Bosnia) family.
Evidence: Vuk (Cyrillic: Вук; 1317–1359), also called Hran, was a powerful magnate in service to the Serbian king Stefan Dušan (r. 1331–55). Vuk was the progenitor of the Kosača family, later influential in the Kingdom of Bosnia in the late 14th- and first half of the 15th century. Косачићи), was a Bosnian medieval noble family which ruled over parts of modern-day Bosnia and Herzegovina, Croatia, Montenegro, and Serbia between the 14th century and the 15th century.