| Millennium: | 1st millennium |
|---|---|
| Centuries: | 4th century – 5th century – 6th century |
| Decades: | 400s 410s 420s – 430s – 440s 450s 460s |
| Years: | 428 429 430 – 431 – 432 433 434 |
| 431 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 431 CDXXXI |
| Ab urbe condita | 1184 |
| Armenian calendar | N/A |
| Assyrian calendar | 5181 |
| Bahá'í calendar | -1413–-1412 |
| Bengali calendar | -162 |
| Berber calendar | 1381 |
| English Regnal year | N/A |
| Buddhist calendar | 975 |
| Burmese calendar | -207 |
| Byzantine calendar | 5939–5940 |
| Chinese calendar | 庚午年十二月初二日 (3067/3127-12-2) — to —
辛未年十一月十二日(3068/3128-11-12) |
| Coptic calendar | 147–148 |
| Ethiopian calendar | 423–424 |
| Hebrew calendar | 4191–4192 |
| Hindu calendars | |
| - Vikram Samvat | 487–488 |
| - Shaka Samvat | 353–354 |
| - Kali Yuga | 3532–3533 |
| Holocene calendar | 10431 |
| Iranian calendar | 191 BP – 190 BP |
| Islamic calendar | 197 BH – 196 BH |
| Japanese calendar | |
| Korean calendar | 2764 |
| Minguo calendar | 1481 before ROC 民前1481年 |
| Thai solar calendar | 974 |
Year 431 (CDXXXI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Bassus and Antiochus (or, less frequently, year 1184 Ab urbe condita). The denomination 431 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.