Events

• 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.

Births

• Aed I of Scotland (approximate date) (d. 878)
• Edmund of East Anglia (approximate date) (d. 870)

Deaths

• June 20 - Louis the Pious, King of the Franks, Emperor of the Holy Roman Empire (b. 778)
• Emperor Junna of Japan (b. 786)