Vuk Kosaa (1317-1359) was in the Kosaa ( a Bosnian medieval noble family which ruled over parts of modern-day Bosnia) family.
Vuk (Cyrillic: ; 13171359), also called Hran, was a powerful magnate in service to the Serbian king Stefan Dusan (r. 133155). Vuk was the progenitor of the Kosaca family, later influential in the Kingdom of Bosnia in the late 14th- and first half of the 15th century. ), 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. 
