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This article is about the year 867. For the number, see 867 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||830s 840s 850s – 860s – 870s 880s 890s|
|Years:||864 865 866 – 867 – 868 869 870|
|867 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1620|
|Chinese calendar||丙戌年 (Fire Dog)
3563 or 3503
— to —
丁亥年 (Fire Pig)
3564 or 3504
|- Vikram Samvat||923–924|
|- Shaka Samvat||789–790|
|- Kali Yuga||3968–3969|
|Japanese calendar||Jōgan 9
|Minguo calendar||1045 before ROC
|Seleucid era||1178/1179 AG|
|Thai solar calendar||1409–1410|
- September – Emperor Michael III is murdered by orders of his co-emperor Basil I. Basil becomes sole ruler (basileus) of the Byzantine Empire and founds the Macedonian Dynasty (until 1056). Basil rebuilds the Byzantine army and navy in an effort to restore the empire.
- August – Treaty of Compiègne: King Charles the Bald cedes the Cotentin Peninsula to Salomon, duke ('king') of Brittany, after he had send his son-in-law Pascweten to negotiate a peace. Charles orders the fortification of the cities Tours, Le Mans and Compiègne.
- Bořivoj I declares himself duke (knyaz) of Bohemia and founds the Pŕemyslid Dynasty (approximate date).
- The rival monarchs Ælla and Osberht of Northumbria, join forces to expel the Great Heathen Army, but are defeated in battle by Ivar the Boneless and Halfdan Ragnarsson. Osberht is killed, while Ælla is executed by the traditional Viking way of the blood eagle.
- Danish Vikings conquer Deira in Northern England, the Northumbrian royal court flees into Bernicia. Ivar the Boneless installs Ecgberht I as a puppet king.
- September – Photius I ("the Great"), patriarch of Constantinople, is removed from office and banished. Ignatius is reinstated as patriarch by Basil I.
- November 13 – Pope Nicholas I dies after a 9-year reign. He is succeeded by Adrian II (also referred to as Hadrian II) as the 106th pope of Rome.
- Gyeon Hwon, king of Hubaekje (Korea) (d. 936)
- October 10 – Li Siyuan, emperor of Later Tang (d. 933)
- Pribislav, prince (knyaz) of Serbia (approximate date)
- Stephen I, patriarch of Constantinople (d. 893)
- June 10 – Uda, emperor of Japan (d. 931)
- Zhao Zong, emperor of the Tang Dynasty (d. 904)
- March 21 – Ælla, king of Northumbria
- Fujiwara no Yoshisuke, Japanese statesman (b. 813)
- Galindo Aznárez I, count of Aragon
- Louis, Frankish archchancellor and abbot
- Michael III, emperor of the Byzantine Empire (b. 840)
- Muhammad ibn Abdallah, Abbasid governor
- November 13 – Nicholas I, pope of the Catholic Church
- March 21 – Osberht, king of Northumbria
- Wasif al-Turki, Abbasid general
- Finlay, pp. 180–181.
- Paul Hill (2009). The Viking Wars of Alfred the Great, p. 30. ISBN 978-1-59416-087-5.