66 BC

Millennium:	1st millennium BC
Centuries:	2nd century BC – 1st century BC – 1st century
Decades:	90s BC  80s BC  70s BC  – 60s BC –  50s BC  40s BC  30s BC
Years:	69 BC 68 BC 67 BC – 66 BC – 65 BC 64 BC 63 BC

66 BC in other calendars

Gregorian calendar	66 BC LXV BC
Ab urbe condita	688
Ancient Egypt era	XXXIII dynasty, 258
- Pharaoh	Ptolemy XII Auletes, 15
Ancient Greek era	178th Olympiad, year 3
Assyrian calendar	4685
Bengali calendar	−658
Berber calendar	885
Buddhist calendar	479
Burmese calendar	−703
Byzantine calendar	5443–5444
Chinese calendar	甲寅年 (Wood Tiger) 2631 or 2571     — to — 乙卯年 (Wood Rabbit) 2632 or 2572
Coptic calendar	−349 – −348
Discordian calendar	1101
Ethiopian calendar	−73 – −72
Hebrew calendar	3695–3696
Hindu calendars
- Vikram Samvat	−9 – −8
- Shaka Samvat	N/A
- Kali Yuga	3036–3037
Holocene calendar	9935
Iranian calendar	687 BP – 686 BP
Islamic calendar	708 BH – 707 BH
Julian calendar	N/A
Korean calendar	2268
Minguo calendar	1977 before ROC 民前1977年
Seleucid era	246/247 AG
Thai solar calendar	477–478

Year 66 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Lepidus and Tullus (or, less frequently, year 688 Ab urbe condita). The denomination 66 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 in Rome

By place

Roman Republic

• Consuls: Manius Aemilius Lepidus and Lucius Volcatius Tullus.
• Catiline accused of conspiring against the Roman Republic with Autronius and the younger Sulla (also in 63 during the consulship of Cicero).
• The alliance between Mithridates VI of Pontus and Tigranes II of Armenia is broken.
• Tigranes II is forced to surrender, by a payment of 6,000 talents, and is reinstated by Pompey as a "friend of the Roman people" to hold Armenia as a buffer zone.
• Battle of the Lycus: Pompey the Great decisively defeats Mithridates VI, effectively ending the Third Mithridatic War.
• Gaius Antonius elected Roman praetor.
• The lex Manilia, supported by Cicero gives Pompey command over all of Asia.
• Cicero becomes praetor in Rome.

Judea

• Aristobulus II becomes king and high priest of Judea, until 63 BC.

Deaths

• Licinius Macer, Roman annalist