| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 5th century BC – 4th century BC – 3rd century BC |
| Decades: | 420s BC 410s BC 400s BC – 390s BC – 380s BC 370s BC 360s BC |
| Years: | 394 BC 393 BC 392 BC – 391 BC – 390 BC 389 BC 388 BC |
| 391 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 391 BC |
| Ab urbe condita | 363 |
| Armenian calendar | N/A |
| Assyrian calendar | 4360 |
| Bahá'í calendar | -2234 – -2233 |
| Bengali calendar | -983 |
| Berber calendar | 560 |
| English Regnal year | N/A |
| Buddhist calendar | 154 |
| Burmese calendar | -1028 |
| Byzantine calendar | 5118 – 5119 |
| Chinese calendar | 己丑年 (2246/2306) — to —
庚寅年(2247/2307) |
| Coptic calendar | -674 – -673 |
| Ethiopian calendar | -398 – -397 |
| Hebrew calendar | 3370 – 3371 |
| Hindu calendars | |
| - Bikram Samwat | -334 – -333 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2711 – 2712 |
| Holocene calendar | 9610 |
| Iranian calendar | 1012 BP – 1011 BP |
| Islamic calendar | 1043 BH – 1042 BH |
| Japanese calendar | |
| Korean calendar | 1943 |
| Minguo calendar | 2302 before ROC 民前2302年 |
| Thai solar calendar | 153 |
| Wikimedia Commons has media related to: 391 BC |
Year 391 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Flavus, Medullinus, Camerinus, Fusus, Mamercinus and Mamercinus (or, less frequently, year 363 Ab urbe condita). The denomination 391 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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