Severus II - Roman Emperor - Information about Severus II including his murder in Ad 307. - http://www.unrv.com/emperors/severus-II.php
Flavius Valerius Severus - Wikipedia entry for this Roman ruler. - http://en.wikipedia.org/wiki/Flavius_Valerius_Severus
DIR Severus II - Essay on the life of the Roman ruler Servus II by Michael DiMaio, Jr. of Salve Regina University. - http://www.roman-emperors.org/severus.htm