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This article is about the year 810. For the number, see 810 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||780s 790s 800s – 810s – 820s 830s 840s|
|Years:||807 808 809 – 810 – 811 812 813|
|810 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1563|
|Chinese calendar||己丑年 (Earth Ox)
3506 or 3446
— to —
庚寅年 (Metal Tiger)
3507 or 3447
|- Vikram Samvat||866–867|
|- Shaka Samvat||732–733|
|- Kali Yuga||3911–3912|
|Japanese calendar||Daidō 5 / Kōnin 1
|Minguo calendar||1102 before ROC
|Seleucid era||1121/1122 AG|
|Thai solar calendar||1352–1353|
- 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. He 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.
- Al-Andalus (modern Spain): Uprising of the city of Mérida against the Umayyad Emirate of Córdoba.
- Tikal Temple III, also known as the Temple of the Jaguar Priest, is constructed in Tikal National Park (modern Guatemala).
- Book of Kells, also known as the Book of Colomba, an illuminated manuscript, is completed by Celtic monks (approximate date).
- Gérard II, Frankish nobleman (approximate date)
- Halfdan the Black, Norwegian nobleman (approximate date)
- Kassia, Byzantine abbess and hymnographer (approximate date)
- Louis the German, king of East Francia (approximate date)
- Muhammad al-Bukhari, Persian Islamic scholar (d. 870)
- Photios I, patriarch of Constantinople (approximate date)
- Xuān Zong, emperor of the Tang Dynasty (d. 859)
- Abul-Abbas, Asian elephant given to Charlemagne
- Æthelburh, Anglo-Saxon abbess
- Eardwulf, king of Northumbria (approximate date)
- Fujiwara no Nakanari, Japanese nobleman (b. 764)
- Gisela, Frankish abbess (b. 757)
- Godfred, king of the Danes
- July 8 – Pippin of Italy, son of Charlemagne
- Rotrude, daughter of Charlemagne
- Thrasco, Obotrite prince
- Vojnomir, duke of Pannonian Croatia (approximate date)