As a young man, Severus advanced under the reigns of Marcus Aurelius and Commodus. Severus seized power after the death of Emperor Pertinax in 193 during the so-called Year of the Five Emperors. After deposing the incumbent emperor Didius Julianus in a bloodless coup, Severus fought his rival claimants, the generals Pescennius Niger and Clodius Albinus. Niger was defeated in 194 at the Battle of Issus, and Albinus three years later at the Battle of Lugdunum. 