Events By Place Roman Empire March 1 — Diocletian and Maximian appoint Constantius Chlorus and Galerius as Caesars. This's considered the beginning of the Tetrarchy. Constantius Chlorus restores the northern Rhine border after defeating the Franks. Franks keep living in the north, because the Roman population has fled. Constantius Chlorus retakes northern Gaul from the usurper Carausius, who retains control of Britain Allectus assassinates Carausius and usurps power in Britain. Asia… (More on 293)