As the Bulgars had been raiding Byzantine lands since 976, the Byzantine government sought to cause dissension amongst them by allowing the escape of their captive emperor Boris II of Bulgaria. Source: Internet
Groups who rebelled or fled from the Avar realm could never be called "Avars", but were rather termed "Bulgars". Source: Internet
He employed Oghuz and Pecheneg mercenaries in this campaign, perhaps to counter the superior cavalry of the Khazars and Bulgars. Source: Internet
Excavations showed that Bulgars buried their dead on a north-south axis,sfn with their heads to the north so that the deceased "faced" south. Source: Internet
His name is mentioned in the excerpt Ziezi ex quo vulgares meaning "Ziezi, of whom the Bulgars" but being regarded by some as the first European reference to the Bulgars as a people. Source: Internet
Likewise, maintaining political control over Rome became untenable as the Eastern Roman Empire itself was beset by the Abbasid Caliphate to the south and Bulgars to the northwest. Source: Internet