In 1279, Ladislaus probably formalized Cuman territorial autonomy in the main region of settlement. 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. The Jazyges colonized central areas in lands adjacent to the main Cuman settlements; however, some settled near the Borcsol, near the Maxond Dunes. Documentary and archeological evidence suggests that at least some Olás Cumans were sent to Bihar County (presently Bihor, Romania). In 1323, tribal leader Demetrius owned Körösszeg fortress. A "Cuman Street" was also attested in medieval Szeged.