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.
Ia adalah putra ketiga Béla II dari Hongaria, dan ketika persekongkolannya melawan saudaranya gagal, Géza II, ia diasingkan dari Hongaria pada musim panas tahun 1157.