Editing 805 (section)

=== By place ===

==== Byzantine Empire ====
* [[Siege of Patras (805 or 807)|Siege of Patras]]: Local [[South Slavs|Slavic]] tribes of the [[Peloponnese]] lay siege to the city of [[Patras]] (modern [[Greece]]), with aid from an [[Arabs|Arab]] fleet. A [[Byzantine Empire|Byzantine]] relief army under [[Skleros]], military governor (''[[Monostrategos|strategos]]'') from [[Corinth]], is sent and retakes the city. The captured Slavs in Patras are made [[Slavery|slaves]], and a church is dedicated to [[Andrew the Apostle|St. Andrew]].{{sfn|Fine|1991|pp=80–81}}

==== Europe ====
* [[Canburg|Siege of Canburg]]: The [[Franks]] under [[Charles the Younger]], son of emperor [[Charlemagne]], unsuccessfully besiege [[Bohemians (tribe)|Bohemians]] near the modern-day town of [[Kadaň]].<ref>{{Cite web |title=Čech, Lech a hradiště Canburg z roku 805 {{!}} Bylo to jinak - Jan Cinert |url=https://www.bylotojinak.cz/cech-lech-a-hradiste-canburg-z-roku-805 |access-date=2025-03-23 |website=www.bylotojinak.cz}}</ref><ref>{{Cite web |title=0805 Bitva o Canburg |url=https://boiohaemum.cz/boiohaemum-encyklopedie/kronika-ceskych-zemi/4283-0805-bitva-o-canburg |access-date=2025-03-23 |website=boiohaemum.cz}}</ref><ref>{{Cite web |title=Canburg a Lech |url=https://www.kampocesku.cz/clanek/29888/canburg-a-lech |access-date=2025-03-23 |website=www.kampocesku.cz}}</ref>
* [[Krum]], ruler (''[[Khan (title)|khan]]'') of the [[First Bulgarian Empire|Bulgarian Empire]], conquers and destroys the Eastern part of the [[Avar Khaganate]] (approximate date). 
* The first known mention of [[Magdeburg]] ([[Saxony-Anhalt]]), founded by Charlemagne, is made.

==== Asia ====
* [[February 25]] &ndash; [[Emperor Dezong of Tang]] dies after a 25-year reign, in which the ''[[fanzhen]]'' is controlled by military governors or [[jiedushi]], who often ignore imperial [[decree]]s. He is succeeded by his son [[Emperor Shunzong of Tang|Shunzong]], who becomes ruler of the [[Tang dynasty|Tang Dynasty]].
* [[August 31]] &ndash; Shunzong issues an [[edict]] to yield the [[throne]] to his son [[Emperor Xianzong of Tang|Xianzong]] (Li Chun), because of an illness, taking for himself the title of "Retired Emperor" (''[[Taishang Huang]]''). Xian is confronted with political disputes in [[Zizhou County|Zi Prefecture]] ([[Shaanxi]]).
* Priest [[Saichō]], patriarch of [[Tendai]] [[Buddhism]], visits [[China]] and introduces [[tea]] to [[Japan]] on his return (or [[804]]).