Severus was born in 427. Severus's full name is Libius Severus. Severus became emperor of the Roman state in 461.
Severus was been emperor by the Senate Recimer. And Severus, Recimer did what he wanted. Severus dealt with internal revolts in the Roman state. The East Roman emperor did not accept Severus as an emperor. So Severus directed only western Rome.
Severus died in 465. The death cause of Severus is unknown.