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81 BC in various calendars
Gregorian calendar	81 BC; LXXXI BC
Ab urbe condita	673
Ancient Egypt era	XXXIII dynasty, 243
- Pharaoh	Ptolemy IX Lathyros, 8
Ancient Greek Olympiad (summer)	174th Olympiad, year 4
Assyrian calendar	4670
Balinese saka calendar	N/A
Bengali calendar	−674 – −673
Berber calendar	870
Buddhist calendar	464
Burmese calendar	−718
Byzantine calendar	5428–5429
Chinese calendar	己亥年 (Earth Pig); 2617 or 2410; — to —; 庚子年 (Metal Rat); 2618 or 2411
Coptic calendar	−364 – −363
Discordian calendar	1086
Ethiopian calendar	−88 – −87
Hebrew calendar	3680–3681
Hindu calendars
- Vikram Samvat	−24 – −23
- Shaka Samvat	N/A
- Kali Yuga	3020–3021
Holocene calendar	9920
Iranian calendar	702 BP – 701 BP
Islamic calendar	724 BH – 723 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2253
Minguo calendar	1992 before ROC; 民前1992年
Nanakshahi calendar	−1548
Seleucid era	231/232 AG
Thai solar calendar	462–463
Tibetan calendar	ས་མོ་ཕག་ལོ་; (female Earth-Boar); 46 or −335 or −1107; — to —; ལྕགས་ཕོ་བྱི་བ་ལོ་; (male Iron-Rat); 47 or −334 or −1106

Year 81 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Decula and Dolabella (or, less frequently, year 673 Ab urbe condita). The denomination 81 BC 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.

Events

By place

Roman Republic

Sulla is appointed dictator, executes his political enemies in a series of proscriptions, and implements aristocratic reforms to the Roman government.
The Second Mithridatic War ends with the status quo.
Cicero wins his first case.

China

Sang Hongyang and 60 Confucian scholars debate over the state monopoly of Iron and Salt.

Births

Deaths

Artaxias I (or Arshak), king of Iberia (Georgia)
Gnaeus Domitius Ahenobarbus, Roman politician
Ptolemy IX Lathyros, king of Ptolemaic Egypt