Ladislaus the Posthumous

Ladislaus the Posthumous, known also as Ladislas , was Duke of Austria, and King of Hungary, Croatia and Bohemia. He was the posthumous son of Albert of Habsburg and Elizabeth of Luxembourg. Although Albert, who ruled Austria, Hungary , and Bohemia, bequeathed all his realms to his future son on his deathbed, only the Estates of Austria accepted his last will. Fearing of an Ottoman invasion, the majority of the Hungarian lords and prelates decided to offer the crown to Vladislaus III of Poland. In Bohemia, the Hussite noblemen and towns refused to acknowledge the hereditary right of the late kings descendants to the throne, but did not elect a new king.

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Source: Wikipedia