- June 15 - Licinius issues his own Edict of Toleration, ending persecution of Christians in his own part of the Roman Empire.
- Maxentius reconquers the African provinces from Domitius Alexander.
- Luoyang, the Han Dynasty capital of China, was sacked by barbarians.
- May - Galerius, Roman emperor
- November 25 - Peter, Patriarch of Alexandria (martyred)
- Jin Huai Di, emperor of China
For the band, see 311 (band).