378
| Years: 374 375 376 377 - 378 - 379 380 381 382 | |
| Decades: 340s 350s 360s - 370s - 380s 390s 400s | |
| Centuries: 3rd century - 4th century - 5th century | |
Events
- Mid-February: Lentienses cross frozen Rhine, invading Roman Empire. Later that year they are defeated by Gratianus.
- August 9: Battle of Adrianople: A large Roman army led by Emperor Valens is defeated by the Visigoths in present-day Turkey. Valens is killed along with 2/3 of his army.
- Gregory Nazianzus is ordained bishop of Constantinople.
- Theodosius I becomes eastern Roman emperor after the death of Valens.
- Pope Damasus I is accused of adultery but is exonerated by emperor Gratian.
- Siyah K'ak' begins to replace Mayan kings with relatives of Spearthrower Owl, emperor of Teotihuacan.
Births
- Germanus of Auxerre, bishop of Auxerre
Deaths
- Roman Emperor Valens (at the Battle of Adrianople)
- Khui Ningomba, Meitei King of Manipur.