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This article is about the year 819. For the number, see 819 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||780s 790s 800s – 810s – 820s 830s 840s|
|Years:||816 817 818 – 819 – 820 821 822|
|819 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1572|
|Chinese calendar||戊戌年 (Earth Dog)
3515 or 3455
— to —
己亥年 (Earth Pig)
3516 or 3456
|- Vikram Samvat||875–876|
|- Shaka Samvat||740–741|
|- Kali Yuga||3919–3920|
|Japanese calendar||Kōnin 10
|Minguo calendar||1093 before ROC
|Seleucid era||1130/1131 AG|
|Thai solar calendar||1361–1362|
- Spring – Emperor Louis I marries Judith of Bavaria in Aachen. She becomes his second wife and empress of the Franks. Like many of the royal marriages of the time Judith is selected through a bridal show.
- Ljudevit, duke of Pannonian Croatia, allying himself with the Slavs and raises a rebellion against the Frankish Empire. Louis I sends an army led by Cadolah of Friuli but is defeated by the Pannonian Slavs.
- Battle of Kupa: Ljudevit defeats the Frankish forces led by Borna, a vassal of Louis I. He escapes with the help of his elite bodyguard. Ljudevit uses the momentum and invades the Duchy of Croatia.
- Nominoe, a noble Briton, is appointed by Louis I as count of Vannes in Brittany (approximate date).
- August 11 – Caliph Al-Ma'mun returns to Baghdad, securing the city's place as the capital of the Abbasid Caliphate.
- March 8 – Li Shidao, Chinese warlord
- Áed Oirdnide, king of Ailech (Ireland)
- Cadolah, duke of Friuli (Italy)
- Cairell mac Fiachnai, king of Ulaid (Ireland)
- Cheng Yi, chancellor of the Tang Dynasty
- Hisham ibn al-Kalbi, Muslim historian (b. 737)
- Liu Zongyuan, Chinese poet and official (b. 773)
- Rogers, Barbara, Bernhard W. Scholz, and Nithardus. Carolingian Chronicles, Royal Frankish Annals Nithard's Histories. Ann Arbor: Univ. of Michigan, 1972. Print.