Odon of Poznań
He was the oldest son of Mieszko III the Old , Duke of Greater Poland ( and since 1173 , High Duke of Poland ) by his first wife , Elisabeth , who was the daughter of King Béla II of Hungary . 
<triplet> Mieszko III the Old <subj> Elisabeth <obj> spouse <triplet> Elisabeth <subj> Mieszko III the Old <obj> spouse <triplet> Béla II of Hungary <subj> Elisabeth <obj> child