him to employ local Jews and Muslims in financial administration, which had for decades been opposed by the Holy See. After returning from Magna Hungaria in 1236, Friar Julian informed Béla of the Mongols, who had by that time reached the Volga River and were planning to invade Europe. The Mongols invaded Desht-i Qipchaq—the westernmost regions of the Eurasian Steppes—and routed the Cumans. Fleeing the Mongols, at least 40,000 Cumans approached the eastern borders of the Kingdom of Hungary and demanded admission in 1239. Béla only agreed to give them shelter after their leader, Köten, promised to convert together with his people to Christianity, and to fight against the Mongols. However, the settlement of masses of nomadic Cumans in the plains along the Tisza River gave rise to many conflicts between them and the local villagers. Béla, who needed the Cumans' military support, rarely punished them for their robberies, rapes and other misdeeds. His Hungarian subjects thought that he was biased in the Cumans' favor, thus "enmity emerged between the people and the king", according to Roger of Torre Maggiore. Béla supported the development of towns. For instance, he confirmed the liberties of the citizens of Székesfehérvár and granted privileges to Hungarian and German settlers in Bars (Starý Tekov, Slovakia) in 1237. Zadar, a town in Dalmatia which had been lost to Venice in 1202, acknowledged Béla's suzerainty in 1240. Mongol invasion of Hungary (1241–42) The Mongols gathered in the lands bordering Hungary and Poland under the command of Batu Khan in December 1240. They demanded Béla's submission to their Great Khan Ögödei, but Béla refused to yield and had the mountain passes fortified. The Mongols broke through the barricades erected in the Verecke Pass (Veretsky Pass, Ukraine) on 12 March 1241. Duke Frederick II of Austria, who arrived to assist Béla against the invaders, defeated a small Mongol troop near Pest. He seized prisoners, including Cumans from the Eurasian Steppes who had been forced to join the Mongols. When the citizens of Pest realized the presence of Cumans in the invading army, mass hysteria emerged. The townsfolk accused Köten and their Cumans of cooperating with the enemy. A riot broke out and the mob massacred Köten's retinue. Köten was either slaughtered or committed suicide. On hearing about Köten's fate, his Cumans decided to leave Hungary and destroyed many villages on their way towards the Balkan Peninsula. With the Cumans'