Septimius Severus Proclaimed Roman Emperor
The murder of Pertinax and the Praetorian Guard's elevation of Didius Julianus destabilized the Roman Empire in 193. Septimius Severus, governor of Upper Pannonia and commander of powerful Danubian legions, emerged as one of several provincial generals able to challenge the government in Rome. On April 9, his troops proclaimed him emperor at Carnuntum. Severus marched rapidly into Italy, won recognition from the Senate, and displaced Julianus before turning against the rival claimants Pescennius Niger and Clodius Albinus. The proclamation began a prolonged struggle rather than an immediate, uncontested succession.
Why it matters: Severus's elevation founded the Severan dynasty and reinforced the decisive role of frontier armies in choosing Roman emperors. His victory expanded military pay and privilege, reduced the political weight of the old senatorial elite, and established patterns of army-backed imperial rule that became increasingly important during the third century.