| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 200s 210s 220s – 230s – 240s 250s 260s |
| Years: | 228 229 230 – 231 – 232 233 234 |
| 231 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 231 CCXXXI |
| Ab urbe condita | 984 |
| Armenian calendar | N/A |
| Assyrian calendar | 4981 |
| Bahá'í calendar | -1613–-1612 |
| Bengali calendar | -362 |
| Berber calendar | 1181 |
| English Regnal year | N/A |
| Buddhist calendar | 775 |
| Burmese calendar | -407 |
| Byzantine calendar | 5739–5740 |
| Chinese calendar | 庚戌年十一月初十日 (2867/2927-11-10) — to —
辛亥年十一月二十日(2868/2928-11-20) |
| Coptic calendar | -53–-52 |
| Ethiopian calendar | 223–224 |
| Hebrew calendar | 3991–3992 |
| Hindu calendars | |
| - Vikram Samvat | 287–288 |
| - Shaka Samvat | 153–154 |
| - Kali Yuga | 3332–3333 |
| Holocene calendar | 10231 |
| Iranian calendar | 391 BP – 390 BP |
| Islamic calendar | 403 BH – 402 BH |
| Japanese calendar | |
| Korean calendar | 2564 |
| Minguo calendar | 1681 before ROC 民前1681年 |
| Thai solar calendar | 774 |
Year 231 (CCXXXI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Claudius and Sallustus (or, less frequently, year 984 Ab urbe condita). The denomination 231 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.