Liberator Urbis Suae
In 293 A.D, the emperor Diocletian introduced the tetrarchy. Each one of the four emperors was to rule one part of the Roman empire so the stability could be assured. But as most of the Roman emperors, all of them sought to rule the empire by themselves. Between the years 309-313 most of the candidates to the imperial office died or were killed in internal wars. Some of them were strangled, some o