...He appears only in the account of the Byzantine court historians Kedrenos and John Skylitzes, who place him at Kerch and calls him "khagan" (the title of the Khazar emperors). Kedrenos states that he was captured by the expeditionary force but does not relate his ultimate fate. Inscriptions and other references exist referring to a Tzul or Tsal clan in Crimea during this period; presumably he was a member although the relationship of that family to the original ruling dynasty of Khazaria is unknown. Almost nothing else about him, including the extent of his holdings, is known. Read full entry

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