Answer
The two major battles that Septimius Severus fought were the Battle of Lyons and the Battle of Edessa. The Battle of Lyons was fought in 197 AD between Severus and the forces of Clodius Albinus, who was Severus' rival for the Roman throne. Severus won the battle and Albinus was killed. The Battle of Edessa was fought in 214 AD between Severus and the Parthian Empire.