Battle of the Milvian Bridge
Constantine defeats Maxentius and takes the West

On 28 October 312 Constantine defeated Maxentius's army at the bridge over the Tiber north of Rome; Maxentius drowned in the river. According to Eusebius, Constantine had a vision of the cross before the battle, and his victory opened the way to the recognition of Christianity in the empire.
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Meanwhile around the world (±25 years)
Africa
- c. 320 Pachomius founds the first communal monastery — 8 years later
- c. 330 Aksum adopts Christianity — 18 years later
Asia
- c. 320 Founding of the Gupta Empire — 8 years later
Alive at the time
- Constantine the Great (aged 40)
- Anthony the Great (aged 61)