Editing 880 (section)

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

==== Byzantine Empire ====
* [[Battle of Cephalonia]]: A [[Byzantine Empire|Byzantine]] fleet, under Admiral [[Nasar]], is sent by Emperor [[Basil I]] to the [[Ionian Islands]]. Nasar defeats the [[Aghlabids]] in a night battle near [[Cephalonia]] (modern [[Greece]]).
* [[May 1]] &ndash; The [[Nea Ekklesia]] is inaugurated in [[Constantinople]], by Patriarch [[Photios I of Constantinople|Photius I]], setting the model for all later [[cross-in-square]] Orthodox churches.<ref name=Mango194>Mango (1986), p. 194.</ref>{{Full citation needed|date=December 2024}}<ref name="Ousterhout34">Ousterhout (2007), p. 34.</ref>{{Full citation needed|date=December 2024}}

==== Europe ====
* [[February 2]] &ndash; [[Battle of Luneberg Heath|Battle of Lüneburg Heath]]: King [[Louis the Younger|Louis III]] is defeated by the Norse [[Great Heathen Army]] at [[Lüneburg Heath]]. The [[Saxons]] are routed in a [[Winter storm|snowstorm]]; many drown in the river or are captured during the retreat.  
* [[Battle of Thimeon]]: King [[Louis the Younger|Louis III]] ("the Younger") defeats [[Vikings]] (probably [[Norsemen]]) from [[England]], near [[Charleroi]], north of the [[Sambre|River Sambre]]. During the battle 5,000 Vikings are killed. 
* [[Battle of Fjaler]]: King [[Harald Fairhair]] moves east along the [[Norway|Norwegian]] coast with his fleet. He defeats his rival [[Atli the Slender|Atle Mjove]] at [[Fjaler]] in [[Sunnfjord]], and lands with his [[longship]]s at [[Tønsberg]].
* [[December]] &ndash; [[Treaty of Ribemont]]: Louis the Younger and the kings of the [[West Francia|West Frankish Kingdom]] sign a treaty. The young Frankish monarch, Louis III, is reduced to merely [[Neustria]]. 
* [[Lambert I of Spoleto|Lambert I]], duke of [[Duchy of Spoleto|Spoleto]], dies while [[Siege|besieging]] the city of [[Capua]]. He is succeeded by his son [[Guy II of Spoleto|Guy II]]. 
* The oldest known mention is made of the city of [[Dortmund]] (approximate date).

==== Asia ====
* [[Fujiwara no Mototsune]], Japanese statesman, creates the position of regent (''[[Sesshō and Kampaku|kampaku]]'') for himself. The [[Fujiwara clan]] will be able to dominate the government for more than 3 centuries.
* [[December 22]] &ndash; [[Luoyang]], eastern Chinese capital of the [[Tang dynasty|Dynasty]], is captured by rebel leader [[Huang Chao]], during the reign of emperor [[Emperor Xizong of Tang|Xi Zong]].

=== By topic ===

==== Religion ====
* [[Pope John VIII]] issues the bull ''Industriae Tuae'', creating an independent [[ecclesiastical province]] in [[Great Moravia]], with archbishop [[Saints Cyril and Methodius|Methodius]] as its head. [[Old Church Slavonic]] is recognized as the fourth [[Sacred language|liturgical language]], besides [[Latin]], [[Greek language|Greek]] and [[Hebrew language|Hebrew]].
* The first known Christian [[Diocese|bishopric]] in [[Slovakia]] is established in the city of [[Nitra]], with [[Wiching]] as [[bishop]].
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