They won a victory at Ardebil when forces led by Barjik defeated an Umayyad army, though the Umayyads retaliated by attacking their capital and killing Hazer Tarkhan.  That capital, Itil, was later destroyed by Sviatoslav of Kiev, whose attacks weakened them in the 10th century.  They were ruled by chieftains known as "begs" and by a supreme ruler known as a "khagan," who may have had a palace on the Volga River.  Constantine V and Justinian II both married women from this culture, and Constantine's son, the Byzantine Emperor Leo IV, was known by this epithet.  FTP, name this Turkish people whose rulers converted to Judaism in the 8th century
They won a victory at Ardebil when forces led by Barjik defeated an Umayyad army, though the Umayyads retaliated by attacking their capital and killing Hazer Tarkhan.  That capital, Itil, was later destroyed by Sviatoslav of Kiev, whose attacks weakened them in the 10th century.  They were ruled by chieftains known as "begs" and by a supreme ruler known as a "khagan," who may have had a palace on the Volga River.  Constantine V and Justinian II both married women from this culture, and Constantine's son, the Byzantine Emperor Leo IV, was known by this epithet.  FTP, name this Turkish people whose rulers converted to Judaism in the 8th century.
They won a victory at Ardebil when forces led by Barjik defeated an Umayyad army, though the Umayyads retaliated by attacking their capital and killing Hazer Tarkhan.  
the Khazars