| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 220s 230s 240s – 250s – 260s 270s 280s |
| Years: | 248 249 250 – 251 – 252 253 254 |
| 251 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 251 CCLI |
| Ab urbe condita | 1004 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1593 – -1592 |
| Bengali calendar | -342 |
| Berber calendar | 1201 |
| Buddhist calendar | 795 |
| Burmese calendar | -387 |
| Byzantine calendar | 5759 – 5760 |
| Chinese calendar | 庚午年十一月廿二日 (2887/2947-11-22) — to —
辛未年十二月初二日(2888/2948-12-2) |
| Coptic calendar | -33 – -32 |
| Ethiopian calendar | 243 – 244 |
| Hebrew calendar | 4011 – 4012 |
| Hindu calendars | |
| - Bikram Samwat | 307 – 308 |
| - Shaka Samvat | 173 – 174 |
| - Kali Yuga | 3352 – 3353 |
| Holocene calendar | 10251 |
| Iranian calendar | 371 BP – 370 BP |
| Islamic calendar | 382 BH – 381 BH |
| Japanese calendar | |
| Korean calendar | 2584 |
| Thai solar calendar | 794 |