Ladislaus was the son of Albert II of Germany, And the reason he's called the Posthumous cause he was born after his fathers death. He was the Duke of Austria, and King of Hungary, Croatia and Bohemia. He ruled Bohemia from 1453 to 1457. in 1457 hr died from a unknown cause most likely being poisoned from George of Podebrady but in the late 1980s it was found out by his skeleton he died from hat he died of juvenile leukemia, He died at only age 17