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General

Population: 225 Million*

• Entertainment: Welsh monk Nynnaiw writes "Historia Britonum"
• Religion: Rule of Abbasid caliph al-Mamun begins as Caliph al-Amim ends
  Synod of Mainz proclaims four days of Christmas
• Science: School of astronomy created at Baghdad
• Deaths: Michael I Rangabe the Byzantine Emperor

Europe

• Holy Roman Empire: Charlemagne crowns his son Louis the Pious

Middle East

• Babylon: School of astronomy created at Baghdad
• Byzantine Empire: End of Emperor Michael I Rangabe
  Leo V the Armenian becomes Byzantine Emperor