Editing 840

{{Use mdy dates|date=February 2011}}
{{Year dab|840}}
{{Year nav|840}}
{{M1 year in topic}}
[[File:Lothar I.jpg|upright=1.35|thumb|Emperor [[Lothair I]] (795–855)]]
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Year '''840''' ('''[[Roman numerals|DCCCXL]]''') was a [[leap year starting on Thursday]] in the [[Julian calendar]], the 840th year of the [[Common Era]] (CE) and [[Anno Domini]] (AD) designations, the 840th year of the [[1st millennium]], the 40th year of the [[9th century]], and the 1st year of the [[840s]] decade.

== Events ==
<onlyinclude>

===By place===

==== Europe ====
* [[June 20]] &ndash; Emperor [[Louis the Pious]] falls ill and dies at his [[Jagdschloss|hunting lodge]], on an island in the [[Rhine]], near his [[Imperial Palace Ingelheim|imperial palace]] at [[Ingelheim am Rhein|Ingelheim]], while suppressing a revolt. His eldest son [[Lothair I]] succeeds him as [[Holy Roman Emperor]], and tries to seize all the territories of the late [[Charlemagne]]. [[Charles the Bald]], 17, becomes king of the [[Francia|Franks]], and joins with his half-brother [[Louis the German]], in resisting Lothair. 
* [[Vikings]] from [[Norway]] capture [[Dublin]], and establish a Norse kingdom in [[Ireland]].

==== Britain ====
* King [[Wigstan|Wigstan of Mercia]], grandson of former ruler [[Wiglaf of Mercia|Wiglaf]] (see [[839]]), declines his kingship in preference of the religious life. He asks his widowed mother, Princess [[Ælfflæd of Mercia (II)|Ælfflæd]], to act as [[regent]]. A [[Nobility|nobleman]] of the line of the late king [[Beornred of Mercia|Beornred]], named Berhtric, wishes to marry her but he is a relative. Wigstan refuses the match, and is murdered by followers of Berhtric at [[Wistow, Leicestershire|Wistow]]. He is buried at [[Repton Abbey]], and later revered as a [[saint]]. The [[Mercia]]n throne is seized by Berhtric's father, [[Beorhtwulf of Mercia|Beorhtwulf]].<ref>Zaluckyj & Zaluckyj, "Decline"</ref>{{rp|238–239}}
* [[Vikings]] make permanent settlements with their first '[[Overwintering|wintering over]]', located at [[Lough Neagh]] in [[Northern Ireland]] (approximate date).

==== Asia ====
* Emperor [[Emperor Wenzong of Tang|Wenzong]] (Li Ang) dies after a 13-year reign, in which he has failed to break the power of his palace [[eunuch]]s. He is succeeded by his brother [[Emperor Wuzong of Tang|Wu Zong]], as Chinese ruler of the [[Tang dynasty]].
* The [[Yenisei Kirghiz]] settle along the [[Yenisei River]], and sack with a force of around 80,000 horsemen the Uyghur capital, [[Ordu-Baliq]] (driving the [[Uyghurs]] out of [[Mongolia]]). This ends  the [[Uyghur Khaganate]].<ref name="ca">[http://www.britannica.com/EBchecked/topic/102315/history-of-Central-Asia/73536/Reunification#73538 History of Central Asia].</ref>
*The [[840 Erzurum earthquake]] takes place in the city of Qaliqala (modern [[Erzurum]]).<ref name="Guidoboni">Guidoboni, Traina, 1995, p. 121</ref>

=== By topic ===

==== Religion ====
* [[Nobis (bishop)|Nobis]] becomes [[bishop]] of [[Diocese of St David's|St. David's]], in the Welsh [[Kingdom of Dyfed]] (approximate date). 
</onlyinclude>

== Births ==
* [[January]] &ndash; [[Michael III]], Byzantine emperor ({{abbr|d.|died}} [[867]]) This date of birth is generally held as uncertain; though January 840 is the most probable, 839 is also possible.
* [[October 25]] &ndash; [[Ya'qub ibn al-Layth al-Saffar]], founder of the [[Saffarid dynasty]] ({{abbr|d.|died}} [[879]])
* [[Saint Nuri|Abu al-Hassan al-Nuri]], Muslim [[Sufism|Sufi]] (approximate date)
* [[Adalhard of Metz|Adalhard II]], Frankish [[Nobility|nobleman]] (approximate date)
* [[Berengaudus]], [[Order of Saint Benedict|Benedictine]] monk ({{abbr|d.|died}} [[892]])
* [[Clement of Ohrid]], Bulgarian scholar (approximate date)
* [[Eudokia Ingerina]], Byzantine empress (approximate date)
* [[Hucbald]], Frankish [[Music theory|music theorist]] (or [[850]])
* [[Lothar I, Count of Stade|Lothar I]], Frankish nobleman ({{abbr|d.|died}} [[880]])
* [[Notker the Stammerer]], Benedictine [[monk]] (approximate date)
* [[Richardis]], Frankish empress (approximate date)
* [[Sunyer II, Count of Empúries|Sunyer II]], Frankish nobleman (approximate date)
* [[Theodard]], archbishop of [[Roman Catholic Diocese of Narbonne|Narbonne]] (approximate date)
* [[Pope Theodore II|Theodore II]], pope of the [[Catholic Church]] ({{abbr|d.|died}} [[897]])
* [[Unruoch III of Friuli|Unruoch III]], margrave of [[Duchy of Friuli|Friuli]] (approximate date)

== Deaths ==
* [[March 14]] &ndash; [[Einhard]], Frankish scholar
* [[June 11]] &ndash; [[Emperor Junna|Junna]], emperor of [[Japan]] ({{abbr|b.|born}} [[785]])
* [[June 16]] or [[839]] &ndash; [[Rorgon I, Count of Maine|Rorgon I]], Frankish nobleman
* [[June 20]] &ndash; [[Louis the Pious]], ruler of the [[Carolingian Empire]] ({{abbr|b.|born}} [[778]])
* [[Agobard]], archbishop of [[Roman Catholic Archdiocese of Lyon|Lyon]] ({{abbr|b.|born}} [[779]]) 
* [[Andrew II of Naples|Andrew II]], duke of [[Duchy of Naples|Naples]]
* [[Ansovinus]], archbishop of [[Roman Catholic Archdiocese of Camerino-San Severino Marche|Camerino]]
* [[Czimislav]], king of the [[Sorbs]] (approximate date)
* [[He Jintao]], general of the [[Tang dynasty]]
* [[Hilduin]], archbishop of [[Roman Catholic Archdiocese of Paris|Paris]] ({{abbr|b.|born}} [[775]])
* [[Li Chengmei]], prince of the Tang dynasty
* [[Li Rong (prince)|Li Rong]], prince of the Tang dynasty 
* [[Muhammad at-Taqi (Ahmed ibn Abadullah)|Muhammad at-Taqi]], Muslim ninth [[Isma'ilism|Ismā'īlī]] imam (or [[839]])
* [[Salmawaih ibn Bunan]], Muslim physician
* [[Emperor Wenzong of Tang|Wen Zong]], emperor of the Tang dynasty ({{abbr|b.|born}} [[809]])
* [[Wigstan]], king of [[Mercia]] (approximate date)
* [[Consort Yang (Wenzong)|Yang]], consort and [[Concubinage|concubine]] of Wen Zong

== References ==
{{Reflist}}

==Sources==
* {{citation | last1=Guidoboni | first1= Emanuela | last2=Traina | first2= Giusto| title=A new catalogue of earthquakes in the historical Armenian area from antiquity to the 12th century | year=1995 | journal=Annals of Geophysics | volume= 38 | doi= 10.4401/ag-4134 | url =https://www.annalsofgeophysics.eu/index.php/annals/article/view/4134| doi-access=free }}

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