The Kabars (Greek: Κάβαροι), also known as Qavars (Qabars)[1] or Khavars[2] were Khazar rebels who joined Magyar tribes and the Rus' Khaganate confederations in the 9th century CE.
Subsequently the Kabars were expelled from Levedia in the Khazar Khaganate leading the Magyar tribal confederacy called Hét-Magyar (meaning "seven Hungarians") to Etelköz while others under Khan-Tuvan sought refuge by joining the Rus' people.
According to Magocsi, "A violent civil war took place during the 820s [...] The losers of the internal political struggle, known as Kabars, fled northward to the Varangian Rus' in the upper Volga region, near Rostov, and southward to the Magyars, who formerly had been loyal vassals of the Khazars.
The presence of Kabar political refugees from Khazaria among the Varangian traders in Rostov helped to raise the latter's prestige, with the consequence that by the 830s a new power center known as the Rus' Khaganate had come into existence.
At that moment, Arnulf, duke of Carinthia, at war with the Slav ruler Svatopluk, prince of Great Moravia (885–894), [citation needed] decided like the Byzantines to appeal to the Hungarians.