823 CE
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). Emperor Saga abdicates the throne, after a 10-year reign. He is succeeded by his brother Junna, as the 53rd emperor of Japan. 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.
Geopolitics & Diplomacy
- 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.source
Conflict & Security
- 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 pleads for clemency and prostrates before Michael, but is executed.source
Religion & Belief
- 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).source
- 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.source
Births
Deaths
- Thomas the Slav, Byzantine general and usurpersource
- Wulfheard, bishop of Hereford (approximate date)source
- Ljudevit, duke of the Slavs in Lower Pannoniasource
- Han Hong, general of the Tang Dynasty b. 765)source
- Boniface I, margrave of Tuscanysource
- Thekla, Byzantine empress (approximate date)source
- Ceolwulf I, king of Mercia (approximate date)source
- Adelochus, archbishop of Strasbourg (b. 786)source