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This article is about the year 823. For the number, see 823 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||790s 800s 810s – 820s – 830s 840s 850s|
|Years:||820 821 822 – 823 – 824 825 826|
|823 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1576|
|Chinese calendar||壬寅年 (Water Tiger)
3519 or 3459
— to —
癸卯年 (Water Rabbit)
3520 or 3460
|- Vikram Samvat||879–880|
|- Shaka Samvat||745–746|
|- Kali Yuga||3924–3925|
|Japanese calendar||Kōnin 14
|Minguo calendar||1089 before ROC
|Seleucid era||1134/1135 AG|
|Thai solar calendar||1365–1366|
- Emperor Michael II defeats the rebel forces under Thomas the Slav in Thrace. He and his supporters are forced to seek refuge in Arkadiopolis (modern Turkey). After five months of blockade, Thomas surrenders and is delivered to Michael seated on a donkey and bound in chains. He pleades for clemency and prostrates before Michael but is executed.
- April 5 – Lothair I, eldest son of emperor Louis I, is crowned co-emperor again by pope Paschal I at Rome. Initiating the papal practice of handing the imperial sword over as a symbol of temporal power in the Holy Roman Empire.
- King Ceolwulf I of Mercia is deposed by Beornwulf who takes the throne of Mercia. During his rule he rebuilds the Abbey of St. Peter and presides over two synods at Clofesho.
- An Arab expeditionary force (10,000 men) conquers Crete, the weakened Byzantine garrison is unable to defend the island (approximate date).
- May 30 – Emperor Saga abdicates the throne after a 10-year reign. He is succeeded by his brother Junna as the 53rd emperor of Japan.
- June 13 – Charles the Bald, king of the Franks (d. 877)
- Ermentrude of Orléans, queen of the Franks (d. 869)
- Muhammad I, Muslim emir of Córdoba (d. 886)
- Pepin II (the Younger), king of Aquitaine
- Ceolwulf I, king of Mercia (approximate date)
- Gondulphus, bishop of Metz
- Ljudevit Posavski, duke of Croatia
- Thomas the Slav, Byzantine general and usurper
- Timothy I, Syrian patriarch