Sevērus, Flavius Valerius in Harper's Dictionary
A Roman emperor (A.D. 306-307). He was proclaimed Caesar by
Galerius in 306, and was soon afterwards sent against
Maxentius, who had assumed the imperial title at Rome. The
expedition, however, was unsuccessful; and Severus, having
surrendered at Ravenna, was taken as a prisoner to Rome, and
compelled to put an end to his life. See Maxentius.