Stephen IV of Hungary

Stephen IV 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 Géza II failed, 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 Eastern Orthodox Church.