Events

• Constantine VI becomes Byzantine Emperor with Irene as guardian.
• Tang De Zong becomes emperor of China.
• Drest III succeeds Alpin II as king of the Picts.
• The city of Osnabrück is founded by Charlemagne (approximate date)

Births

• Muḥammad ibn Mūsā al-Ḵwārizmī, Muslim mathematician (approximate date)

Deaths

• September 8 - Leo IV, Byzantine Emperor

780

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