 In exchange for feudal duties to the Hungarian king in his war against the Mongols, the Cumans were allowed to keep their own ethnic customs.Despite being regionally centered in the Great Plain, "tiny groups of Cumans and Jazyges" could still be found throughout the Kingdom in the 13th century.The Kór and Borcsol stayed in the southeastern counties of Csanád and Temes; a Zeihan "Dux Cumanorum" ("Duke of the Cumans") is mentioned here in 1255.