Old Great Bulgaria
Kubrat organised the Onogurs under his Empire of Old Great Bulgaria in the Mid 7th century. From the 8th century, the Byzantine sources often mention the Onoghurs in close connection with the Bulgars. Agathon (early 8th century) wrote about the "nation of Onoghur Bulgars". Nikephoros I (early 9th century) noted that Kubrat was the lord of the "Onoghundurs"; his contemporary Theophanes referred to them as "Onoghundur–Bulgars". Kubrat successfully revolted against the Avars and founded the Old Great Bulgaria ("Magna Bulgaria"), also known as "Onoghundur–Bulgars" state, or "Patria Onoguria" in the "Ravenna Cosmography". Constantine VII (mid-10th century) remarked that the Bulgars formerly called themselves "Onogundurs".