Robert was a French-born prelate in the Kingdom of Hungary in the first decades of the 13th century. He was Archbishop of Esztergom between 1226 and 1239 and Bishop of Veszprém from 1209 till 1226. He played a decisive role in the establishment of the short-lived Diocese of Cumania. He was sharply opposed to the employment of Jews and Muslims in the administration of the royal revenues. He even put Hungary under interdict to force Andrew II of Hungary to dismiss his non-Christian officials.

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 as 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.