Asparukh of Bulgaria vs Nikephoros I

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.

Nikephoros I implemented fiscal reforms to replenish the treasury depleted by Irene. He increased taxes, reorganized the tax system, and imposed new levies on the church and monasteries. These measures strengthened the state finances but caused resentment.

Nikephoros I overthrew Empress Irene in a palace coup. As a former logothete (finance minister), he was experienced in administration. His accession marked a shift from the iconoclast policies of previous emperors.

Nikephoros I led a large expedition against the Bulgarian Khan Krum. Initially successful, he captured the Bulgarian capital Pliska and plundered it. However, the campaign ended in disaster when the Byzantine army was ambushed in a mountain pass.

Nikephoros I was killed in the Battle of Pliska, where the Byzantine army was annihilated by the Bulgars. His skull was reportedly made into a drinking cup by Khan Krum. This was one of the worst Byzantine military defeats.