Béla of Macsó

[2] Their mother submitted a formal complaint against her brother to Pope Urban IV, but the "junior king" did not hand back their possessions.

[2] The “senior king” appointed the young Béla (his grandson) to lead one of his troops, but the actual leader of the royal army was Henry Kőszegi.

[2] The two kings (Béla’s grandfather and uncle) concluded a new peace on March 23, 1266 on the Margaret Island and affirmed the former division of the Kingdom of Hungary between them.

[3] The Hungarian troops sent by Béla’s grandfather then managed to capture Stefan Uroš himself, and the Serbian king was forced to purchase his release.

[1] In November, the members of Henry Kőszegi’s retinue killed Béla (who was the young king’s closest adult male relative at that time) following a sharp dispute.