Stephen IV of Hungary

Stephen IV
Stephen IV depicted in the Illuminated Chronicle
King of Hungary and Croatia contested by Stephen III
Reign	1163–1165
Coronation	27 January 1163
Predecessor	Ladislaus II
Successor	Stephen III
Born	c. 1133
Died	11 April 1165 (aged 31–32) Zimony (now Zemun in Serbia)
Spouse	Maria Komnene
House	Árpád dynasty
Father	Béla II of Hungary
Mother	Helena of Rascia
Religion	Roman Catholic

Stephen IV (Hungarian: IV. István, Croatian: Stjepan IV, Slovak: Štefan IV; c. 1133 – 11 April 1165) was King of Hungary and Croatia, ascending to the throne between 1163 and 1165, when he usurped the crown of his nephew, Stephen III. He was the third son of Béla II of Hungary, and when his conspiracy against his brother failed, Géza II, he was exiled from Hungary in the summer of 1157. He first sought refuge in the Holy Roman Empire, but received no support from Emperor Frederick I. Shortly afterwards he moved to the Byzantine Empire, where he married a niece of Emperor Manuel I Komnenos, Maria Komnene, and converted to the Orthodox Church.

After Géza II died on 31 May 1162, Emperor Manuel attempted to assist Stephen against his nephew and namesake, Stephen III, in seizing the crown. Although the Hungarian lords were willing to leave their young monarch, they sharply opposed Stephen and elected his brother, Ladislaus II, king. Ladislaus II granted the ducatus, or duchy, which included one-third of the kingdom, to Stephen. Ladislaus II died on 14 January 1163, and Stephen succeeded him. Lucas, Archbishop of Esztergom, who remained a staunch supporter of the expelled young Stephen III, denied to crown him and excommunicated him. Stephen IV remained unpopular among the Hungarian lords, enabling his nephew to muster an army. In the decisive battle, which was fought at Székesfehérvár on 19 June 1163, the younger Stephen routed his uncle, forcing him once again to flee Hungary.