391
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| Millennium: | 1st millennium |
|---|---|
| Centuries: | 3rd century – 4th century – 5th century |
| Decades: | 360s 370s 380s – 390s – 400s 410s 420s |
| Years: | 388 389 390 – 391 – 392 393 394 |
391 was a common year.
Events
- Theodosius, the Roman Emperor, decrees that Christianity should be the only religion allowed in the Empire.