391
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| Millennium: | 1st millennium |
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| Centuries: | 3rd century – 4th century – 5th century |
| Decades: | 360s 370s 380s – 390s – 400s 410s 420s |
| Years: | 388 389 390 – 391 – 392 393 394 |
| 391 by topic |
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| Arts, history, and science |
| Countries |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
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391 (CCCXCI) was a common year starting on Wednesday of the Julian calendar, the 391st year of the Common Era (CE) and Anno Domini (AD) designations, the 391st year of the 1st millennium, the 91st year of the 4th century, and the 2nd year of the 390s decade. As of the start of 391, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.
Events
- Theodosius, the Roman Emperor, decrees that Christianity should be the only religion allowed in the Empire.
391 Media
The Temple of Vesta (Rome)