- Louis the Pious divides his empire among his sons; Louis the German becomes king of East Francia, Lothar I becomes co-emperor.
- The Bulgarian siege of Constantinople ends.
- January 25: Pope Paschal I succeeds Pope Stephen IV as the 98th pope.
- The Grand Tribunal is held at Durenmar.
- Admission of the Order of Miscellany into the Order of Hermes as House Ex Miscellanea.