300s | dn1=310s | dn2=320s | dn3=330s }} Events By Place Roman Empire May 1 — Diocletian and Maximian, Emperors of Rome, retire from office. Constantius Chlorus and Galerius are declared Augusti; Flavius Valerius Severus and Maximinus Daia are appointed Caesars. The Arch of Galerius's built. In the Western Empire, the capital's moved from Rome to Milan. Maximinus Daïa (305–313) persecutes the Christians of Egypt, many of whom take refuge in the desert. In time, this refuge… (More on 305)