813

Years: 809 810 811 812 - 813 - 814 815 816 817
Decades: 780s 790s 800s - 810s - 820s 830s 840s
Centuries: 8th century - 9th century - 10th century

June 22 - Byzantine Emperor Michael I is defeated in a war against the Bulgarians.
July 12 - A revolt puts Leo V on the throne of the Byzantine Empire; former emperor Michael becomes a monk. Beginning of the Second Iconoclastic Period.
Louis the Pious crowned co-emperor of the Franks with his father Charlemagne.
Baghdad school of astronomy opened by Al Mamon.
Third Council of Tours: priests are ordered to preach in the vernacular (either Vulgar Latin or German)
The Bulgars capture Adrianople.

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