Events

• May 1 - Diocletian and Maximian, emperors of Rome, retire from office.
• Constantius Chlorus and Galerius declared Augusti; Flavius Valerius Severus and Maximinus Daia appointed Caesars.
• The Arch of Galerius is built.

Births

Deaths

• Hierocles, proconsul of Bithynia who instigated the persecution of the Christians under Galerius
• Porphyry, Neoplatonist philosopher