|Centuries:||1st century BC – 1st century – 2nd century|
|Decades:||30s 40s 50s – 60s – 70s 80s 90s|
|Years:||63 64 65 – 66 – 67 68 69|
|66 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||819|
|Chinese calendar||乙丑年 (Wood Ox)
2762 or 2702
— to —
丙寅年 (Fire Tiger)
2763 or 2703
|Coptic calendar||−218 – −217|
|- Vikram Samvat||122–123|
|- Shaka Samvat||N/A|
|- Kali Yuga||3166–3167|
|Iranian calendar||556 BP – 555 BP|
|Islamic calendar||573 BH – 572 BH|
|Minguo calendar||1846 before ROC
|Seleucid era||377/378 AG|
|Thai solar calendar||608–609|
Year 66 (LXVI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Telesinus and Paullinus (or, less frequently, year 819 Ab urbe condita). The denomination 66 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.
- September 22 – Emperor Nero creates the Legio Legio I Italica. He appoints Titus Flavius Vespasian legate of the army of Judea and in command of three legions — V Macedonica, X Fretensis and XV Apollinaris.
- October – The Jewish Revolt (66–70 AD) commences against the Roman Empire. The Zealots lay siege on Jerusalem and annihilate the Roman garrison (a cohort of Legio III Cyrenaica). The Sicarii capture the fortress of Masada overlooking the Dead Sea.
- Mid–late October – Cestius Gallus, legate of Syria, marches into Judea and leads a Roman army of 30,000 men to put down the Jewish rebellion. At its core is Legio XII Fulminata, plus 2,000 picked men from the other three Syrian legions, six more cohorts of infantry and four alae of cavalry, and over 14,000 auxiliaries furnished by Rome's eastern allies, including Herod Agrippa II and two other client kings, Antiochus IV of Commagene and Sohaemus of Emesa, who lead their forces (largely archers and cavalry) in person.
- Gallus leads his main force down the coast from Caesarea via Antipatris to Lydda, detaching other units, by land and sea, to neutralize the rebel strongholds at Joppa, Narbata and the Tower of Aphek. With Galilee and the entire Judean coast in his hands, Gallus assumes his campaign before the winter rains render the roads impassable. He turns inland and marches on Jerusalem, taking the road via the plain at Emmaus. Gallus succeeds in conquering Beit She'arim (the "New City") on the Bezetha Hill.
- November – Battle of Beth-Horon: Gallus abandons the siege of Jerusalem and chooses, for uncertain reasons, to withdraw west to winter quarters, where he is ambushed and defeated by Judean rebels. Some 5,300 Roman troops are killed, as well as all their pack animals, their artillery (which is to serve the Jews of Jerusalem during Titus's siege operations four years later), and the greatest disgrace of all, the eagle standard of Legio XII Fulminata. Gallus abandons his troops in disarray, fleeing to Syria.
- Suetonius Paullinus, governor of Britannia, becomes a Roman Consul.
- The Roman Legio II Augusta is stationed at Gloucester.
Arts and sciences
- Dioscorides writes his De Materia Medica, a treatise on the methodical treatment of disease by use of medicine (approximate date).
- Halley's Comet is visible.
- The First Epistle to Timothy is written (speculative date, if actually written by St. Paul).
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- Si Sheppard (2013). The Jewish Revolt 66–74, p. 20. ISBN 978-1-78096-183-5
- Si Sheppard (2013). The Jewish Revolt 66–74 AD, p. 10. ISBN 978-1-78096-183-5
- Si Sheppard (2013). The Jewish Revolt 66–74 AD, p. 11. ISBN 978-1-78096-183-5
- Si Sheppard (2013). The Jewish Revolt 66–74 AD, pp. 14–16. ISBN 978-1-78096-183-5