Centuries: 3rd century - 4th century - 5th century
- August 30 - Council of Arles, which confirmed the pronouncement of Donatism as a schism, and passed other canons.
- Synod of Ancyra: consulting a magician is declared a sin earning five years of penance.
- Pope Silvester I succeeds Pope Miltiades.
- Alexander becomes Bishop of Byzantium.