312
| Years: 308 309 310 311 - 312 - 313 314 315 316 | |
| Decades: 280s 290s 300s - 310s - 320s 330s 340s | |
| Centuries: 3rd century - 4th century - 5th century | |
Events
- October 28 - Battle of Milvian Bridge: Constantine defeats Maxentius in the fight to become emperor of Rome. He also is converted to Christianity.
- Arch of Constantine built in Rome
Deaths
- October 28 - Maxentius, Roman Emperor slain in battle