51 BC
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| 1st millennium BC |
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| 51 BC by topic |
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| Arts, history, and science |
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| Lists of leaders |
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| Gregorian calendar | 51 BC L BC |
| Ab urbe condita | 703 |
| Ancient Egypt era | XXXIII dynasty, 273 |
| - Pharaoh | Cleopatra VII, 1 |
| Ancient Greek era | 182nd Olympiad, year 2 |
| Assyrian calendar | 4700 |
| Balinese saka calendar | N/A |
| Bengali calendar | −643 |
| Berber calendar | 900 |
| Buddhist calendar | 494 |
| Burmese calendar | −688 |
| Byzantine calendar | 5458–5459 |
| Chinese calendar | 己巳年 (Earth Snake) 2646 or 2586 — to — 庚午年 (Metal Horse) 2647 or 2587 |
| Coptic calendar | −334 – −333 |
| Discordian calendar | 1116 |
| Ethiopian calendar | −58 – −57 |
| Hebrew calendar | 3710–3711 |
| Hindu calendars | |
| - Vikram Samvat | 6–7 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3050–3051 |
| Holocene calendar | 9950 |
| Iranian calendar | 672 BP – 671 BP |
| Islamic calendar | 693 BH – 692 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 2283 |
| Minguo calendar | 1962 before ROC 民前1962年 |
| Nanakshahi calendar | −1518 |
| Seleucid era | 261/262 AG |
| Thai solar calendar | 492–493 |
| Tibetan calendar | ས་མོ་སྦྲུལ་ལོ་ (female Earth-Snake) 76 or −305 or −1077 — to — ལྕགས་ཕོ་རྟ་ལོ་ (male Iron-Horse) 77 or −304 or −1076 |
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Year 51 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Marcellus and Sulpicius.
Events
- Pompey demands that Julius Caesar end his command
- Cleopatra VII and her younger brother Ptolemy XIII begin co-rule of Egypt
- The Hsiung-nu split into two hordes
Births
- Publius Sulpicius Quirinius, Roman governor of Syria (d. 21 AD)
- Cheng, Emperor of the Han Dynasty of China (d. 7 BC)
Deaths
- Pharaoh Ptolemy XII of Egypt (b. 117 BC)
- Posidonius of Apamea, Greek philosopher, astronomer, geographer (b. c. 135 BC)