822

By place

Byzantine Empire

• Byzantine general and usurper Thomas the Slav continues his revolt against Emperor Michael II. He unsuccessfully besieges Constantinople, while his fleet is destroyed by Michael's fleet, using Greek fire.
• Battle of Kedouktos : Khan Omurtag of Bulgaria sends a relief army, and defeats the Byzantine rebels.

  Europe

• Emperor Louis I performs public penance for causing his nephew Bernard's death 4 years earlier, at his palace of Attigny, before Pope Paschal I, and the Frankish nobles.
• The earliest known mention of the Serbs, in Einhard's Royal Frankish Annals.

  Britain

• King Ceolwulf I of Mercia invades Powys, but is beaten back by King Cyngen. However, Ceolwulf does destroy the fortress of Deganwy, and later takes the kingdom under his control.

  Al-Andalus

• Al-Hakam I, Umayyad emir of Córdoba, dies after a 26-year reign. He is succeeded by his son Abd al-Rahman II, who begins a military campaign against King Alfonso II of Asturias in Al-Andalus.

  Asia

• Kim Hŏn-ch'ang launches a short-lived rebellion in Silla, which gains control over much of the southern and western Korean Peninsula.

  Central America

• February 6 - Ukit Took becomes the last ruler of the Mayan city-state Copán. After his death in 830, the kingdom is wiped out, most likely from an epidemic.

  By topic

Religion

• Rabanus Maurus, a Frankish Benedictine monk, becomes abbot of Fulda, after the death of Eigil.