867

867 in various calendars
Gregorian calendar	867; DCCCLXVII
Ab urbe condita	1620
Armenian calendar	316; ԹՎ ՅԺԶ
Assyrian calendar	5617
Balinese saka calendar	788–789
Bengali calendar	274
Berber calendar	1817
Buddhist calendar	1411
Burmese calendar	229
Byzantine calendar	6375–6376
Chinese calendar	丙戌年 (Fire Dog); 3564 or 3357; — to —; 丁亥年 (Fire Pig); 3565 or 3358
Coptic calendar	583–584
Discordian calendar	2033
Ethiopian calendar	859–860
Hebrew calendar	4627–4628
Hindu calendars
- Vikram Samvat	923–924
- Shaka Samvat	788–789
- Kali Yuga	3967–3968
Holocene calendar	10867
Iranian calendar	245–246
Islamic calendar	252–253
Japanese calendar	Jōgan 9; (貞観９年)
Javanese calendar	764–765
Julian calendar	867; DCCCLXVII
Korean calendar	3200
Minguo calendar	1045 before ROC; 民前1045年
Nanakshahi calendar	−601
Seleucid era	1178/1179 AG
Thai solar calendar	1409–1410
Tibetan calendar	阳火狗年; (male Fire-Dog); 993 or 612 or −160; — to —; 阴火猪年; (female Fire-Pig); 994 or 613 or −159

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

Year 867 (DCCCLXVII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.

Events

September 24 – Emperor Michael III is murdered, by order 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.^[1]

August – Treaty of Compiègne: King Charles the Bald cedes the Cotentin Peninsula to Salomon, duke ('king') of Brittany, after he had sent his son-in-law Pascweten to negotiate a peace. Charles orders the fortification of the cities of Tours, Le Mans and Compiègne.
Bořivoj I declares himself duke (knyaz) of Bohemia, and founds the Přemyslid Dynasty (approximate date).

Vikings or "Danes" (the two terms were often used interchangeably at the time), comprising the Great Heathen Army, advance northward from bases in the Kingdom of East Anglia, into the Anglo-Saxon Kingdom of Northumbria.
- Deira, the southernmost part of Northumbria, is conquered by the Vikings. Ivar the Boneless, one of their leaders, installs a puppet king of Northumbria, Ecgberht I.^[2]
- The rival monarchs of Northumbria, Ælla and Osberht, join forces in an attempt to expel the Great Heathen Army, but are defeated in battle by Ivar the Boneless and Halfdan Ragnarsson. Osberht is killed in battle, while Ælla is reportedly captured, before being subject to the blood eagle: a combined method of torture and execution.
- Surviving members of the Northumbrian court flee into the northernmost part of the kingdom, Bernicia.

The Council of Constantinople is held (presided over by Patriarch Photius), which anathematizes the use of the Filioque clause in the Creed, and also Pope Nicholas I, for his attacks on the work of Greek missionaries in Bulgaria.
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.

^ Finlay, G. (1856). History of the Byzantine Empire from DCCXVI to MLVII (2nd ed.). W. Blackwood. pp. 180–181.
^ Paul Hill (2009). The Viking Wars of Alfred the Great, p. 30. ISBN 978-1-59416-087-5.