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This article is about the year 866. For the area code, see Toll-free telephone number.
|866 by topic|
|Ab urbe condita||1619|
|Chinese calendar||乙酉年 (Wood Rooster)
3562 or 3502
— to —
丙戌年 (Fire Dog)
3563 or 3503
|- Vikram Samvat||922–923|
|- Shaka Samvat||787–788|
|- Kali Yuga||3966–3967|
|Japanese calendar||Jōgan 8
|Minguo calendar||1046 before ROC
|Seleucid era||1177/1178 AG|
|Thai solar calendar||1408–1409|
|Wikimedia Commons has media related to 866.|
- Spring – Bardas, the regent of the Byzantine Empire, is murdered by Basil the Macedonian at Miletus, while conducting a large-scale expedition against the Saracen stronghold of Crete.
- May 26 – Basil the Macedonian is crowned co-emperor of the Byzantine Empire, and is adopted by the much younger Michael III.
- May 27 – King Ordoño I dies after a 16-year reign. He is succeeded by his son Alfonso III ("the Great"), as ruler of Asturias.
- July 2 – Battle of Brissarthe: Frankish forces, led by Robert the Strong, are defeated by a joint Breton-Viking army.
- Harald Fairhair wins a decisive battle, in his quest to become king of all of Norway.
- Louis II, Holy Roman Emperor, defeats the Saracen invaders who are ravaging southern Italy.
- The Great Heathen Army of the Vikings rides north to Northumbria. The Northumbrians are preoccupied with a civil war, and the Danes enter York unopposed.
- October 17 – Caliph al-Musta'in is put to death, after a 4-year reign. He is succeeded by al-Mu'tazz, who becomes the youngest Abbasid caliph to assume power.
- The Kharijite revolt against the Abbasid Caliphate begins in Al-Jazira (Upper Mesopotamia), which will last for 30 years.
- Fujiwara no Yoshifusa becomes regent (sesshō) to assist the child emperor Seiwa, starting the Fujiwara regency.
- Boris I, ruler (knyaz) of the Bulgarian Empire, sends a diplomatic mission, led by the Bulgarian nobleman Peter, to Rome, in an effort to renew ties with the West.
- Pope Nicholas I forbids the use of torture, in prosecutions for witchcraft (approximate date).
- September 19 – Leo VI, Byzantine emperor (d. 912)
- Carloman II, king of the West Frankish Kingdom (approximate date)
- Robert I, king of the West Frankish Kingdom (d. 923)
- Savaric I, bishop of Mondoñedo (d. 877)
- Yao Yi, chancellor of Later Tang (d. 940)
- April 21 – Bardas, Byzantine chief minister and regent
- May 27 – Ordoño I, king of Asturias
- June 21 – Rodulf, Frankish archbishop
- July 2 – Robert the Strong, Frankish nobleman
- July 16 – Irmgard, Frankish abbess
- October 17 – Al-Musta'in, Abbasid caliph
- Adelaide of Tours, Frankish noblewoman
- Al-Mu'ayyad, Abbasid prince
- Charles the Child, king of Aquitaine
- Eberhard, duke of Friuli
- Emenon, Frankish nobleman
- Hungerus Frisus, bishop of Utrecht
- Linji Yixuan, Chinese monk and founder of the Linji school
- Liudolf, duke of Saxony
- Ranulf I, Frankish nobleman (b. 820)
- Robert, Frankish nobleman (b. 834)
- Rudolph, Frankish nobleman
- Wang Shaoyi, general of the Tang Dynasty
- John Haywood (1995). Historical Atlas of the Vikings, p. 62. Penguin Books: ISBN 978-0-140-51328-8
- History of the Arabs by Philip K. Hitti.