| 401 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 401 BC |
| Ab urbe condita | 353 |
| Armenian calendar | N/A |
| Assyrian calendar | 4350 |
| Bahá'í calendar | -2244–-2243 |
| Bengali calendar | -993 |
| Berber calendar | 550 |
| English Regnal year | N/A |
| Buddhist calendar | 144 |
| Burmese calendar | -1038 |
| Byzantine calendar | 5108–5109 |
| Chinese calendar | 己卯年 (2236/2296) — to —
庚辰年(2237/2297) |
| Coptic calendar | -684–-683 |
| Ethiopian calendar | -408–-407 |
| Hebrew calendar | 3360–3361 |
| Hindu calendars | |
| - Vikram Samvat | -344–-343 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2701–2702 |
| Holocene calendar | 9600 |
| Iranian calendar | 1022 BP – 1021 BP |
| Islamic calendar | 1053 BH – 1052 BH |
| Japanese calendar | |
| Korean calendar | 1933 |
| Minguo calendar | 2312 before ROC 民前2312年 |
| Thai solar calendar | 143 |
| Wikimedia Commons has media related to: 401 BC |
Year 401 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Potitus, Cossus, Camillus, Ambustus, Mamercinus and Iullus (or, less frequently, year 353 Ab urbe condita). The denomination 401 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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