Bayirku

Bayirku (In Chinese chronicles (Ba-yegu / Ba-yegu), in runic inscriptions bajarqu, and in the chronicle collection ''Jami' al-tawarikh by Rashid al-Din as barqut (Bargut) is the historical name of an ethnic community repeatedly mentioned in various medieval sources.

They occupied territories roughly covering northern Mongolia and southern Transbaikalia, from the Tuul River and the lower reaches of the Selenga to Dalai Nur and the Argun. Later, due to “Khitan pressure”, their area was constrained and displaced, then subsequently expanded westward beyond Lake Baikal. Their territory later came to be understood as spanning both sides of Lake Baikal, and eventually predominantly as the Cis-Baikal region.