840

• After the death of Louis the Pious, his sons Lothar, Charles the Bald and Louis the German fight over the division of the empire, with Lothar succeding as Emperor.
• Tang Wu Zong succeeds Tang Wen Zong as emperor of China.
• Foundation of Dublin by Vikings.

• Aed I of Scotland (approximate date)
• Ethelred of Wessex (approximate date)
• Edmund of East Anglia (approximate date)

• June 20: Louis the Pious, king of the Franks, Emperor
• Emperor Junna of Japan

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