Flavius Valerius Severus was a soldier from the
Illyrian provinces before his associate
Galerius appointed him
Caesar in
305. On the death of
Constantine I in
306, he was promoted
Augustus. When
Maxentius, the son of the retired emperor
Maximian, revolted at
Rome, Galerius sent him to suppress the rebellion, but the walls of Rome and the desertion of his own men forced him to retreat to
Ravenna, where he surrendered to Maximian.
When Galerius himself invaded Italy in 307 to suppress both Maxentius and his father, Maxentius treacherously had him killed at Tres Tabernae[?].
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