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This article is about the year 813. For the number, see 813 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||780s 790s 800s – 810s – 820s 830s 840s|
|Years:||810 811 812 – 813 – 814 815 816|
|813 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1566|
|Chinese calendar||壬辰年 (Water Dragon)
3509 or 3449
— to —
癸巳年 (Water Snake)
3510 or 3450
|- Vikram Samvat||869–870|
|- Shaka Samvat||735–736|
|- Kali Yuga||3914–3915|
|Japanese calendar||Kōnin 4
|Minguo calendar||1099 before ROC
|Seleucid era||1124/1125 AG|
|Thai solar calendar||1355–1356|
|Wikimedia Commons has media related to 813.|
- June 22 – Byzantine Emperor Michael I Rangabe is defeated in a war against the Bulgarians.
- July 11 – A revolt puts Leo V on the throne of the Byzantine Empire; former emperor Michael I Rangabe becomes a monk, beginning the Second Iconoclastic Period.
- Ashot I becomes the first Georgian Bagratid prince of Iberia under the Byzantine protection.
- Louis the Pious is crowned co-emperor of the Franks with his father Charlemagne.
- The Bulgars capture Adrianople.
- Forces from today's Denmark attack today's Vestfold due to insubordination.
- Fourth Fitna: The Siege of Baghdad ends with the fall of the city and the death of al-Amin, making al-Mamun the undisputed Abbasid caliph.
- The Baghdad School of Astronomy is opened by al-Mamun.
- Third Council of Tours: Priests are ordered to preach in the vernacular (either Vulgar Latin or German).
- Li Shangyin, Chinese poet and official (d. 858)
- Theo Groso, Merchant and world traveler
- Theophilos, Byzantine emperor
- Wandelbert, Benedictine monk
- Abu Nuwas, poet