The Kabars (Gr. Kabaroi) or Kavars were a Turkic tribal confeeration who lived in the vicinity of Poltava in the 9th century. They consisted of three Khazar tribes who rebelled against the Khazar Khaganate some time in the ninth century; the rebellion was notable enough to be included in Constantine Porphyrogenitus's work De Administrando Imperio. The presence of a Turkic aristocracy among the Magyars would explain the Byzantine protocol by which, in the exchange of ambassadors under Constantine Porphyrogenitus, Magyar rulers were always referred to as "Princes of the Turks".