Batbayan

Batbayan ruled the Khazarian Bulgars from 667 to 690 CE.^[1][2] Theophanes and Nicephorus record his rule after the Khazars defeated the Bulgars and Old Great Bulgaria disintegrated in 668 CE.^[3]

Bat Bayan
Ruler of Bulgars
Reign	667 to 690 CE
Predecessor	Kubrat
Father	Kubrat

There is a scholarly theory that he may have been the same person as Bezmer^[4] of the Nominalia of the Bulgarian khans who may have been also the first son of Kubrat.^[5] He was a member of the Dulo clan, who after Kubrat's death in the mid-7th century ruled Old Great Bulgaria, but his rule lasted only three years.^[6] Kevin Alan Brook calls him Bayan.^[7] Batbayan would subsequently have ruled the Bulgars as a subject of the Khazar Khagan.