Duke of Styria
Stephen took part in his father's military campaign against the Styrians, who had rebelled against the rule of the King of Hungary, in 1258. After the successful campaign, King Béla IV appointed him to Duke of Styria.
His government, however, was unpopular among his new subjects, who rebelled against him with the support of King Ottokar II of Bohemia. Stephen and his father started an attack against Ottokar's lands, but their troops were defeated on 12 July 1260 in the Battle of Kroissenbrunn. Following the battle, the two Kings of Hungary ceded the Duchy of Styria to the King of Bohemia in the Peace of Pressburg.
Read more about this topic: Stephen V Of Hungary
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