Editing 867 (section)

== Events ==
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=== By place ===

==== Byzantine Empire ====
* [[September 24]] &ndash; 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|Macedonian Dynasty]] (until [[1056]]). Basil rebuilds the [[Byzantine army]] and navy, in an effort to restore the empire.<ref>{{cite book |last=Finlay |first= G. |year=1856 |title= History of the Byzantine Empire from DCCXVI to MLVII |edition= 2nd |publisher= W. Blackwood | pages= 180–181}}</ref>

==== Europe ====
* [[August]] &ndash; [[Treaty of Compiègne (867)|Treaty of Compiègne]]: King [[Charles the Bald]] cedes the [[Cotentin Peninsula]] to [[Salomon, King of Brittany|Salomon]], duke ('king') of [[Duchy of Brittany|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, Duke of Bohemia|Bořivoj I]] declares himself duke (''[[knyaz]]'') of [[Duchy of Bohemia|Bohemia]], and founds the [[Přemyslid dynasty|Přemyslid Dynasty]] (approximate date).

==== Britain ====
*  [[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 monarch|puppet king]] of Northumbria, [[Ecgberht I of Northumbria|Ecgberht I]].<ref>Paul Hill (2009). ''The Viking Wars of Alfred the Great'', p. 30. {{ISBN|978-1-59416-087-5}}.</ref>
** The rival monarchs of Northumbria, [[Ælla of Northumbria|Ælla]] and [[Osberht of Northumbria|Osberht]], join forces in an attempt to expel  the Great Heathen Army, but are [[Battle of York (867)|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 (royal)|court]] flee into the northernmost part of the kingdom, [[Bernicia]].

=== By topic ===

==== Religion ====
* The [[Council of Constantinople (867)|Council of Constantinople]] is held (presided over by Patriarch [[Photius the Great|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]] &ndash; [[Patriarch Photios I of Constantinople|Photius I]] ("the Great"), patriarch of [[Constantinople]], is removed from office and banished. [[Patriarch Ignatios of Constantinople|Ignatius]] is reinstated as [[Ecumenical Patriarch of Constantinople|patriarch]] by Basil I.
* [[November 13]] &ndash; [[Pope Nicholas I]] dies after a 9-year reign. He is succeeded by [[Pope Adrian II|Adrian II]] (also referred to as Hadrian II), as the 106th [[pope]] of [[Rome]].
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