Kabar
The Kabars (Greek: Κάβαροι), also known as Qavars (Qabars) or Khavars, were Khazar rebels who joined Magyar tribes and the Rus' Khaganate confederations in the 9th century CE. == Sources == The Byzantine Emperor Constantine VII is the principal source of the Kabar history. He dedicated a whole chapter—chapter 39—to the Kabars (or Kabaroi) in his De Administrando Imperio, which was completed around 950.