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Ladislaus the Posthumous (; 1 January 1272 – 29 October 1290) was Duke of Austria, King of Hungary, Croatia and Bohemia. He was born on 1 January 1272 in Vienna, Austria, the only child of King Stephen V of Hungary and Elisabeth of Cumania. His father died on 6 August 1272, when Ladislaus was just six months old, and he succeeded him as King of Hungary.