Stephen the Posthumous was the posthumous son of King Andrew II of Hungary by his third wife, Beatrice d'Este. Wikipedia
Born: 1236, Wehrda, Marburg, Germany
Died: April 10, 1271 (age 35 years), Venice, Italy
Parents: Andrew II of Hungary and Beatrice d'Este, Queen of Hungary
Children: Andrew III of Hungary
Grandchild: Elizabeth of Töss
Partner: Tomasina Morosini and Erzsébet Traversari
Siblings: Elizabeth of Hungary