Stephen the Posthumous

Stephen the Posthumous (Hungarian: Utószülött István; 1236–1271) was the posthumous son of King Andrew II of Hungary by his third wife, Beatrice d'Este. He was regarded as bastard son of infidelity by his much older half-brothers, including King Béla IV of Hungary, and was not allowed to receive ducal revenues from Hungary to which he would have been entitled as son of a Hungarian king.

He was first married to a widow, Isabella Traversari, by whom he had a short-lived son named Stephen. His second wife was Tomasina Morosini. Their son would later become King Andrew III of Hungary.