Bayandur is one of Turkic tribes known from Arab and Persian Middle Age geographers and writers as being one of the seven tribes in the Kimak Kaganate in the period of 743-1050 AD. The other six constituent tribes per Abu Said Gardizi (died 1061) were Kimaks, Yamaks, Kipchaks, Tatars, Lanikaz, and Ajlad. The Arabian sources list Bayandurs as a constituent clan of Oguzes, and other eastern sources list Bayandur as a Kipchak clan. As a N. Pontic Kipchak clan, Bayandurs entered the early Rus annals that describe events of the 11th century.