| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 220s 230s 240s – 250s – 260s 270s 280s |
| Years: | 253 254 255 – 256 – 257 258 259 |
| 256 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 256 CCLVI |
| Ab urbe condita | 1009 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1588 – -1587 |
| Bengali calendar | -337 |
| Berber calendar | 1206 |
| Buddhist calendar | 800 |
| Burmese calendar | -382 |
| Byzantine calendar | 5764 – 5765 |
| Chinese calendar | 乙亥年十一月十七日 (2892/2952-11-17) — to —
丙子年十一月廿八日(2893/2953-11-28) |
| Coptic calendar | -28 – -27 |
| Ethiopian calendar | 248 – 249 |
| Hebrew calendar | 4016 – 4017 |
| Hindu calendars | |
| - Bikram Samwat | 312 – 313 |
| - Shaka Samvat | 178 – 179 |
| - Kali Yuga | 3357 – 3358 |
| Holocene calendar | 10256 |
| Iranian calendar | 366 BP – 365 BP |
| Islamic calendar | 377 BH – 376 BH |
| Japanese calendar | |
| Korean calendar | 2589 |
| Thai solar calendar | 799 |