Andrew III of Hungary
Vladislav's maternal cousin, Charles Martel of Anjou, who had laid claim to Hungary, awarded Vladislav with Slavonia and granted him the title of duke, implying that Vladislav and his father supported Charles Martel against Andrew III of Hungary in the early 1290s. Charles Martel's father, Charles II of Naples, confirmed the grant on 19 August 1292. Dragutin and Vladislav sought reconciliation with Andrew III. In 1293, Vladislav married Constance who was a granddaughter of the king's maternal uncle, Albertino Morosini.