Years: 838 839 840 841 - 842 - 843 844 845 846

Decades: 810s 820s 830s - 840s - 850s 860s 870s

Centuries: 8th century - 9th century - 10th century

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
• Emperor Saga of Japan
• Alfonso II of Asturias
• Byzantine Emperor Theophilus