Events

• Oath of Strasbourg - alliance of Louis the German and Charles the Bald against emperor Lothar - sworn and recorded in vernacular languages.
• Ramiro I succeeds Alfonso II as king of Asturias.
• Three year old Michael III succeeds Theophilus (emperor) as emperor of Byzantium.
• Uurad is succeeded by Bred , then Kineth .
• End of the reign of caliph Moqtasim .
• Charles the Bald marries Ermentrude.

Deaths

• January 5 - Al-Mu'tasim, Abbasid caliph (b. 794)
• Emperor Saga of Japan (b. 786)
• Alfonso II of Asturias (b. 759)
• Byzantine Emperor Theophilus (b. 813)