51 BC

Millennium:	1st millennium BC
Centuries:	2nd century BC – 1st century BC – 1st century
Decades:	80s BC  70s BC  60s BC  – 50s BC –  40s BC  30s BC  20s BC
Years:	54 BC 53 BC 52 BC – 51 BC – 50 BC 49 BC 48 BC

51 BC in other calendars

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	阴土蛇年 (female Earth-Snake) 76 or −305 or −1077     — to — 阳金马年 (male Iron-Horse) 77 or −304 or −1076

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)