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Male Istvan of Slavonia Click to view Istvan of Slavonia in the family tree

Istvan of was born in 1236.  Istvan of's father was ANDREW II OF HUNGARY and his mother was Beatrice d'Este.  His paternal grandparents were BELA III OF HUNGARY and AGNES DE CHATILLON. He had three half-brothers and three half-sisters, named BELA IV OF, Kalman of, Andras of, Maria of, St. Elizabeth of and VIOLANTE OF.  He died at the age of 35 on April 10th, 1271 in Venice.

Sources/Citations
Foundation for Medieval Genealogy; http://fmg.ac/; Medieval Lands @ Hungary, Chapter 5, http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=wprokasy&id=I51438

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