Asparukh of Bulgaria

Asparukh's Bulgar forces defeated the Byzantine army of Emperor Constantine IV at the Battle of Ongal in the Danube delta. This victory allowed the Bulgars to settle permanently south of the Danube and establish their state.

Asparukh led the Bulgar tribes across the Danube River and established the First Bulgarian Empire in the territory of modern-day Bulgaria. He defeated Byzantine forces and secured recognition of the new state through a treaty with Emperor Constantine IV.

Asparukh negotiated a peace treaty with the Byzantine Empire that recognized the First Bulgarian Empire as an independent state. The treaty also established a tribute payment from Byzantium to Bulgaria.