Task: Text Categorization
Input (English): This man defeated such rival claimants as Pescennius Niger and Clodius Albinus after coming to power, and he attempted to forestall palace coups by replacing the entire Praetorian Guard. After the death of this man, his wife Julia Domna exercised great power over his successors. He bade his time as governor of Upper Pannonia during the chaos following the murder of Commodus, eventually using the unavenged death of Pertinax as a pretext to overthrow a rich man who had won the Imperial throne at an auction, Didius Julianus. For 10 points, name this Roman emperor who ruled from 193 to 211 and was the namesake of a group that included Elagabalus, Geta, and Caracalla, the Severan Dynasty.
Output (English): History