810

By place

Byzantine Empire

• Spring - The Venetian dukes change sides again, submitting to King Pepin, under the authority of his father Charlemagne, who then proceeds to take Venice. Emperor Nikephoros I sends a Byzantine fleet to Dalmatia, prompting Pepin to withdraw to the mainland. A legate is dispatched to Venice, where he deposes the turncoat dukes, before continuing on to Aachen, to negotiate a peace with Charlemagne. Charlemagne recognises Byzantine dominance over Venice and Dalmatia in the Adriatic Sea.

Europe

• King Godfred of the Danes leads 200 Viking ships to plunder the Frisian coast, and forces the merchants to pay 100 pounds of silver. He claims Northern Frisia as Danish territory.
• Godfred is killed by one of his housecarls, and is succeeded by Hemming. According to Notker of Saint Gall, the bodyguard who murdered Godfred is possibly one of his sons.
• Al-Andalus : The city of Mérida rises up against the Emirate of Córdoba.

Asia

• In Japan, in the abdicated emperor Heizei's name, a high-ranked female courtier Fujiwara no Kusuko, and her brother Nakanari organize an attempted rebellion, but their forces are defeated. Kusuko dies in poison, and her brother is executed. Heizei takes the tonsure, and becomes a Buddhist monk.

By topic

Religion

• Tikal Temple III, also known as the Temple of the Jaguar Priest, is constructed in Tikal National Park.
• The Book of Kells, an illuminated manuscript, is completed by Celtic monks.