| Millennium: | 1st millennium |
|---|---|
| Centuries: | 4th century – 5th century – 6th century |
| Decades: | 460s 470s 480s – 490s – 500s 510s 520s |
| Years: | 488 489 490 – 491 – 492 493 494 |
| 491 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 491 CDXCI |
| Ab urbe condita | 1244 |
| Armenian calendar | N/A |
| Assyrian calendar | 5241 |
| Bahá'í calendar | -1353–-1352 |
| Bengali calendar | -102 |
| Berber calendar | 1441 |
| English Regnal year | N/A |
| Buddhist calendar | 1035 |
| Burmese calendar | -147 |
| Byzantine calendar | 5999–6000 |
| Chinese calendar | 庚午年十二月初六日 (3127/3187-12-6) — to —
辛未年十一月十五日(3128/3188-11-15) |
| Coptic calendar | 207–208 |
| Ethiopian calendar | 483–484 |
| Hebrew calendar | 4251–4252 |
| Hindu calendars | |
| - Vikram Samvat | 547–548 |
| - Shaka Samvat | 413–414 |
| - Kali Yuga | 3592–3593 |
| Holocene calendar | 10491 |
| Iranian calendar | 131 BP – 130 BP |
| Islamic calendar | 135 BH – 134 BH |
| Japanese calendar | |
| Korean calendar | 2824 |
| Minguo calendar | 1421 before ROC 民前1421年 |
| Thai solar calendar | 1034 |
Year 491 (CDXCI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Olybrius without colleague (or, less frequently, year 1244 Ab urbe condita). The denomination 491 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.