Bela IV of Hungary

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Béla IV (1206-1270) was the king of Hungary between 1235 and 1270.

Bela was the son of Andrew II. Bela tried with little success to reestablish royal preeminence by reacquiring lost crown lands. His efforts, however, created a deep rift between the crown and the magnates just as the Mongols were sweeping westward across Russia toward Europe. Aware of the danger, Bela ordered the magnates and lesser nobles to mobilize. Few responded, and the Mongols routed Bela's army at Mohi on April 11, 1241.

Bela fled first to Austria, where Duke Frederick of Babenberg held him for ransom, then to Dalmatia. The Mongols reduced Hungary's towns and villages to ashes and slaughtered half the population before news arrived in 1242 that the Great Khan Ogotai had died in Karakorum. The Mongols withdrew, sparing Bela and what remained of his kingdom.