Khalyzians
The Khalyzians or Chalyzians (Arabic: Khalis, Khwarezmian: Khwalis, Byzantine Greek: Χαλίσιοι, Khalisioi, Magyar: Kálizok, also known in German sources as Kolzen, Koltzil, Kotziler and Cozlones) were the Bessi "Black-Cuman" people of the Carpathian Basin mentioned from 680s to the 1240s in various Medieval sources such as the 12th-century Byzantine historian John Kinnamos. Their name derived from the Khwarezm region of Central Asia.