Asparukh of Bulgaria vs Li Chun

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.

Li Chun launched a series of military campaigns to reassert central control over rebellious fanzhen. He defeated the warlords of Sichuan, Zhenhai, and other provinces, reducing their autonomy and restoring imperial authority.

Li Chun's forces defeated the powerful Zhaoyi fanzhen, whose military governor had rebelled. This victory was a major achievement of the Yuanhe Restoration, demonstrating the Tang court's renewed military strength.

After a long campaign, the Chengde fanzhen submitted to central authority. This was the last major fanzhen to be brought under control during Li Chun's reign, marking the peak of the Yuanhe Restoration.

Li Chun died in 820, possibly poisoned by eunuchs. His death ended the Yuanhe Restoration, and subsequent emperors were unable to maintain the central authority he had reestablished.