Severus (Flavius Valerius Severus), d. 307, Roman emperor (306–7). He participated with Galerius in an unsuccessful attempt to overthrow Maxentius . Surrendering to Maximian (father of Maxentius) at Ravenna on the condition that his life be spared, Severus was taken to Rome. He was later, however, treacherously killed by Maxentius.
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