Batbayan-Bezmer was placed in charge of the Bolgars by Chouvrtou but was overthrown in 677. While the three Kiabar tribes revolted, the Boyanids consolidated their rule around Cuzdrioara , Ungvar and Halych where his people continued to pay tribute to the Turks of Azov until the 800s. He seems to have been descended from the Aba clan making him the ancestor of Bulan. He and his descendants after him remained loyal to the Kara-Khazars converted to Judaism under Bulan whose descendants were the Kiabar-Cozars in Kopyriv Kinets'.