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In page Helena of Serbia, Queen of Hungary:

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Around 1129, King Stephen II arranged her marriage with his cousin Béla, who had been blinded on the order of the king's father, King Coloman of Hungary (r. 1095–1116). Béla and his father Almos were blinded, so that they will be removed from the line of succession. However, King Stephen was childless and decided to recognise Béla as his successor.[citation needed] Uroš I had prior to this suffered to both Hungary and Byzantium, so he happily befriended the Hungarian king.[3] King Stephen II granted estates near Tolna to the newly wed couple.