866

Year 866 (DCCCLXVI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Millennium:	1st millennium
Centuries:	8th century 9th century 10th century
Decades:	840s 850s 860s 870s 880s
Years:	863 864 865 866 867 868 869

866 in various calendars

Gregorian calendar	866 DCCCLXVI
Ab urbe condita	1619
Armenian calendar	315 ԹՎ ՅԺԵ
Assyrian calendar	5616
Balinese saka calendar	787–788
Bengali calendar	273
Berber calendar	1816
Buddhist calendar	1410
Burmese calendar	228
Byzantine calendar	6374–6375
Chinese calendar	乙酉年 (Wood Rooster) 3562 or 3502     — to — 丙戌年 (Fire Dog) 3563 or 3503
Coptic calendar	582–583
Discordian calendar	2032
Ethiopian calendar	858–859
Hebrew calendar	4626–4627
Hindu calendars
- Vikram Samvat	922–923
- Shaka Samvat	787–788
- Kali Yuga	3966–3967
Holocene calendar	10866
Iranian calendar	244–245
Islamic calendar	251–252
Japanese calendar	Jōgan 8 (貞観８年)
Javanese calendar	763–764
Julian calendar	866 DCCCLXVI
Korean calendar	3199
Minguo calendar	1046 before ROC 民前1046年
Nanakshahi calendar	−602
Seleucid era	1177/1178 AG
Thai solar calendar	1408–1409
Tibetan calendar	阴木鸡年 (female Wood-Rooster) 992 or 611 or −161     — to — 阳火狗年 (male Fire-Dog) 993 or 612 or −160

Fujiwara no Yoshifusa (804–872)

Events

Byzantine Empire

• April 21 – 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.

Europe

• May 27 – King Ordoño I, ruler of the Kingdom of Asturias dies after a 16-year reign. He is succeeded by his son, Alfonso III, who later is referred to as "Alfonso the Great".
• July 2 – Battle of Brissarthe: Frankish forces, led by Robert the Strong, are defeated by a joint Breton-Viking army.
• Louis II, Holy Roman Emperor, defeats the Saracen invaders who are ravaging southern Italy.

Britain

• 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.[1]

Abbasid Caliphate

• 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.[2]
• The Kharijite revolt against the Abbasid Caliphate begins in Al-Jazira (Upper Mesopotamia), which will last for 30 years.

Japan

• Fujiwara no Yoshifusa becomes regent (sesshō) to assist the child emperor Seiwa, starting the Fujiwara regency.

Religion

• 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).

Births

• June 10 – Uda, emperor of Japan (d. 931)
• 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)

Deaths

• 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

References

1. John Haywood (1995). Historical Atlas of the Vikings, p. 62. Penguin Books: ISBN 978-0-140-51328-8
2. History of the Arabs by Philip K. Hitti.