page_title: Béla IV of Hungary
section_title: Duke of Slavonia (1220–26)
hierarchical_section_title: Béla IV of Hungary / Rex iunior / Duke of Slavonia (1220–26)
caption_attribution_description: Klis, Croatia
context_page_description: Béla IV was King of Hungary and Croatia between 1235 and 1270, and Duke of Styria from 1254 to 1258. As the oldest son of King Andrew II, he was crowned upon the initiative of a group of influential noblemen in his father's lifetime in 1214. His father, who strongly opposed Béla's coronation, refused to give him a province to rule until 1220. In this year, Béla was appointed Duke of Slavonia, also with jurisdiction in Croatia and Dalmatia. Around the same time, Béla married Maria, a daughter of Theodore I Laskaris, Emperor of Nicaea. From 1226, he governed Transylvania with the title Duke. He supported Christian missions among the pagan Cumans who dwelled in the plains to the east of his province. Some Cuman chieftains acknowledged his suzerainty and he adopted the title of King of Cumania in 1233. King Andrew died on 21 September 1235 and Béla succeeded him. He attempted to restore royal authority, which had diminished under his father. For this purpose, he revised his predecessors' land grants and reclaimed former royal estates, causing discontent among the noblemen and the prelates.
  The Mongols invaded Hungary and annihilated Béla's army in the Battle of Mohi on 11 April 1241.
context_section_description: The senior king ceded the lands between the Adriatic Sea and the Dráva River—Croatia, Dalmatia and Slavonia—to Béla in 1220. A letter of 1222 of Pope Honorius III reveals that "some wicked men" had forced Andrew II to share his realms with his heir.  Béla initially styled himself as "King Andrew's son and King" in his charters; from 1222 he used the title "by the Grace of God, King, son of the King of Hungary, and Duke of all Slavonia".
  Béla separated from his wife in the first half of 1222 upon his father's demand. However, Pope Honorius refused to declare the marriage illegal. Béla accepted the Pope's decision and took refuge in Austria from his father's anger. He returned, together with his wife, only after the prelates had in the first half of 1223 persuaded his father to forgive him. Having returned to his Duchy of Slavonia, Béla launched a campaign against Domald of Sidraga, a rebellious Dalmatian nobleman, and captured Domald's fortress at Klis. Domald's domains were confiscated and distributed among his rivals, the Šubići, who had supported Béla during the siege.
caption: Klis Fortress (seen from its west point, toward east); Béla captured it from Domald of Sidraga, a rebellious Dalmatian nobleman in 1223
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