 In 1406, king Ladislaus of Naples gifted Prozor Fortress, at that time "Castrum Werhlychky", as a center of "Vrlička župa" to the Hrvoje Vukčić.Hrvoje Vukčić Hrvatinić was most powerful Bosnian nobleman and magnate of his time, and caried a title of "Grand Duke of Bosnia, Knyaz of Donji Kraji, and Duke of Split" (later Herzog of Split), and now he was made by Ladislaus his "deputy for this Dalmatian territory, calling him his Vicar General for the regions of Slavonia (in partibus Sclavonie)".He was the most prominent member of House of Hrvatinić, one of the most important of three feudal families in medieval Bosnia at the time, beside royal dynasty.