| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century BC – 1st century – 2nd century |
| Decades: | 20s 30s 40s – 50s – 60s 70s 80s |
| Years: | 48 49 50 – 51 – 52 53 54 |
| 51 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 51 LI |
| Ab urbe condita | 804 |
| Armenian calendar | N/A |
| Assyrian calendar | 4801 |
| Bahá'í calendar | -1793–-1792 |
| Bengali calendar | -542 |
| Berber calendar | 1001 |
| English Regnal year | N/A |
| Buddhist calendar | 595 |
| Burmese calendar | -587 |
| Byzantine calendar | 5559–5560 |
| Chinese calendar | 庚戌年十一月三十日 (2687/2747-11-30) — to —
辛亥年十一月初十日(2688/2748-11-10) |
| Coptic calendar | -233–-232 |
| Ethiopian calendar | 43–44 |
| Hebrew calendar | 3811–3812 |
| Hindu calendars | |
| - Vikram Samvat | 107–108 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3152–3153 |
| Holocene calendar | 10051 |
| Iranian calendar | 571 BP – 570 BP |
| Islamic calendar | 589 BH – 588 BH |
| Japanese calendar | |
| Korean calendar | 2384 |
| Minguo calendar | 1861 before ROC 民前1861年 |
| Thai solar calendar | 594 |
Year 51 (LI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Scipio (or, less frequently, year 804 Ab urbe condita). The denomination 51 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.