Avar Khaganate
Bulgars were Turkic nomadic people, who participated in the 5th-century Hunnic confederation. Upon Attila's death, the tribes that later formed the Bulgars had retreated east into the Black Sea-Caspian Steppe. The western Bulgar tribes joined the Avar Khaganate, while the eastern Bulgars came under the Western Turkic Khaganate by the end of the 6th century.