 At that moment, these branches are accepting the confessions of the Roman Catholic Church and Islam.The family name "Kosača" was probably taken after the village of Kosače near Goražde, in the Upper Drina region of eastern Bosnia, where the Kosača family were originally estate owners.The founder, Vuk was a prominent military commander under Emperor Dušan the Mighty of Serbia (r. 1331–1359) who took part in the conquests of southern Balkans.