First Bulgar Empire (Fall of Constantinople 675AD)

It was one of the strongest Kingdoms from the South eastern area of europe, having rejected Islam over Roman Christianity leading to several continues clashes with the Rum Caliphate over the course of its existence, the Bulgar Empire first existence in the location of OTL bulgaria being in between the period of 753 - 758 when during the Ummayyad conflict with the abbasids managed to capture a great portion of Moesia and the balkans from them. The Bulgar Empire is destroyed in the early 10th century by a group of Islamic supported nobles that form the Islamic Sultanate of Bulgaria in 908