The eastern part remained divided: Sembat, which had the main title, governed the western part of the Eastern Syunik with the Vayots Dzor, bordered by Vaspurakan. Sahak governed the eastern part until the river Hakar. Babgen governed the district of the Baghk, and Vasak (who died in 922) an indeterminate territory. Nasr, the emir of Azerbaijan, captured territory through perfidy against Babgen and Sahak in Dwin. After the invasion, Sembat unseated Nasr and obtained the freedom of his brothers. Sembat was followed by his son Vasak, and Sahak in turn by his son Sembat. Vasak received the royal title from the Muslims at the end of his reign, which lasted until 963.