Accoring to Khazar tradition as related in the Khazar Correspondence, Kozar was the name of the eponymous ancestor of the Khazar people. In King Joseph's Reply to Hasdai ibn Shaprut he is described as one of the sons of Togarmah and the brother of Bulgar, Ujur, Tauris, Avar, Uauz, Bizal, Tarna, Janur, and Sabir (Sawir).