Editing 823 (section)

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

==== Byzantine Empire ====
* Emperor [[Michael II]] defeats the rebel forces under [[Thomas the Slav]] in [[Thrace]]. He and his supporters are forced to seek refuge in [[Lüleburgaz|Arkadiopolis]] (modern [[Turkey]]). After five months of [[blockade]], Thomas surrenders and is delivered to Michael, seated on a [[donkey]] and bound in chains. He pleads for clemency and [[Prostration|prostrates]] before Michael, but is executed.<ref>{{cite book|last=Bury|first=John Bagnell|authorlink=J.B. Bury|title=A History of the Eastern Roman Empire from the Fall of Irene to the Accession of Basil I (A.D. 802–867)|location=London |publisher=Macmillan and Company|year=1912|url=https://archive.org/details/ahistoryeastern00burygoog|oclc=458995052|pages=105–106}}</ref><ref>{{The Byzantine Revival, 780–842| pages=241–242}}</ref>

==== Europe ====
* [[April 5]] &ndash; [[Lothair I]], eldest son of Emperor [[Louis the Pious|Louis I]], is crowned co-emperor again by [[Pope Paschal I]] at [[Rome]] (initiating the [[Pope|papal]] practice of handing the imperial sword over, as a symbol of temporal power in the [[Holy Roman Empire]]).

==== Britain ====
* King [[Ceolwulf I of Mercia]] is deposed by [[Beornwulf of Mercia|Beornwulf]], who takes the [[throne]] of [[Mercia]]. During his rule he rebuilds the [[Gloucester Cathedral|Abbey of St. Peter]], and presides over two [[synod]]s at [[Council of Clovesho|Clofesho]].

==== Japan ====
* [[May 30]] &ndash; [[Emperor Saga]] abdicates the throne, after a 10-year reign. He is succeeded by his brother [[Emperor Junna|Junna]], as the 53rd [[emperor of Japan]].
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