Battle of Ongal

Bulgar victory

Krum's campaigns

Simeon I's campaigns

Sviatoslav's invasion of Bulgaria

Byzantine conquest of Bulgaria

Uprising of Peter Delyan

Second Bulgarian Empire

The Battle of Ongal took place in the summer of 680 in a Ongal area, an unspecified location in & around the Danube delta almost the Peuce Island, present-day Tulcea County, Romania. It was fought between the Bulgars, who had recently invaded the Balkans, together with the Byzantine Empire, which ultimately lost the battle. The battle was crucial for the creation of the First Bulgarian Empire.

Aftermath

After the victory, the Bulgars contemporary south and seized the lands to the north of Stara Planina. In 681 they invaded Thrace defeating the Byzantines again. Constantine IV found himself in a dead-lock and invited for peace.