810

Events

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.

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.<ref>Notker the Stammerer, De Carolo Magno, Book II, Chapter 13.</ref>
Al-Andalus (modern Spain): The city of Mérida rises up against the Emirate of Córdoba.<ref name=rucquoi1993>Template:Cite book</ref>

In Japan, in the abdicated emperor Heizei's name, a high-ranked female courtier Template:Nihongo, and her brother Nakanari organized an attempted rebellion, but their forces were defeated. Kusuko died in poison and her brother was executed. Heizei took the tonsure and became a Buddhist monk.<ref name="ponsonby318">Ponsonby-Fane, p. 318. Brown and Ishida, pp. 281</ref>

Tikal Temple III, also known as the Temple of the Jaguar Priest,<ref name="Coe67p76">Coe 1967, 1988, p. 76.</ref> is constructed in Tikal National Park (modern Guatemala).
The Book of Kells (also known as the Book of Colomba), an illuminated manuscript, is completed by Celtic monks (approximate date).