* Rhodri "Mawr" ('the Great') becomes king of Gwynedd.
June 15— Louis II is crowned King of Lombardy by Pope Sergius II.
Nominoe, Count of Vannes, raids into Maine and plunders the territory.
* According to the
Annales Bertiniani, Nominoe makes war on the Vikings.
Dorestadis raided by the Vikings.
January— Pope Sergius IIsucceeds Pope Gregory IVas the 102nd pope.
January 11- Abdullah ibn Muhammad al-Umawi
Judith of Flanders, Queen of Wessex
January 11— Michael I Rhangabes, Byzantine Emperor
January 25— Pope Gregory IV
Merfyn Frych ap Gwriad, king of Gwynedd
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