800 – 849
800 Coronation of Charlemagne, king of the Franks and now first Holy Roman Emperor, on Christmas day. Crowned by Pope Leo III as “Augustus, crowned of God, emperor of the Romans” in St. Peter’s Basilica in Rome, he would become Charles I of France, called Charles the Great.
802 Byzantine empress Irene deposed and exiled to the island of Lesbos: minister of finance Nicephorus I succeeds her.
805 Japanese Buddhist priest Saicho returns from China to Japan and popularizes the medicinal value of tea.
807 Abbasid caliph Harun al Rashid decrees that Baghdad Christians are to wear a blue badge and Jews a yellow badge.
808 City of Fez extablished in Morocco by Abbasid King Idris.
809 Abbasid caliph Harun al-Rashid dies; he will be memorialized in Arabian Nights.
814 Charlemagne dies of pleurisy. He is succeeded by his son, Louis I (the Pious).
829 Nile frozen over (happens again in 1010).
840 Emperor Louis the Pious dies. Wuzong becomes emperor of China.
841 Vikings build a settlement on the south bank of the River Liffey; it will eventually become the city of Dublin.
843 The three sons of deceased Emperor Louis the Pious sign the Treaty of Verdun, dividing the Carolingian Empire into much of what modern Europe is today.