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This article is about the year 820. For the number, see 820 (number). For the professional DotA player, see Zou Yitian.
|Centuries:||8th century – 9th century – 10th century|
|Decades:||790s 800s 810s – 820s – 830s 840s 850s|
|Years:||817 818 819 – 820 – 821 822 823|
|820 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1573|
|Chinese calendar||己亥年 (Earth Pig)
3516 or 3456
— to —
庚子年 (Metal Rat)
3517 or 3457
|- Vikram Samvat||876–877|
|- Shaka Samvat||742–743|
|- Kali Yuga||3921–3922|
|Japanese calendar||Kōnin 11
|Minguo calendar||1092 before ROC
|Seleucid era||1131/1132 AG|
|Thai solar calendar||1362–1363|
- December 25 – Emperor Leo V ("the Armenian") is assassinated by conspirators in the Hagia Sophia at Constantinople. Though unarmed, he fights back fiercely but dies of his wounds. He is succeeded by Michael II, commander of the palace guard (excubitores). Leo's family (including his mother and his wife Theodosia) is exiled to monasteries in Princes' Islands.
- Tahir ibn Husayn, an Iranian general, is appointed to governor of Khurasan for supporting the Abbasid Caliphate.
- Emperor Xian Zong dies from poisoning (due to medicines) after a 14-year reign. He is succeeded by his son Mu Zong as ruler of the Tang Dynasty of China.
- Grimbald, Frankish Benedictine monk (d. 903)
- Ranulf I of Aquitaine, Frankish nobleman (d. 866)
- Rhodri the Great, king of Gwynedd (Wales) (approximate date)
- Adi Shankara, Indian philosopher and theologian (b. 788)
- Causantín mac Fergusa, king of the Picts (approximate date)
- December 25 – Leo V, emperor of the Byzantine Empire (b. 775)
- Lupo III, duke of Gascony (approximate date)
- Muhammad ibn Idris al-Shafi‘i, Muslim imam (b. 767)
- Tutu Chengcui, eunuch and advisor of the Tang Dynasty
- Wang Chengzong, general of the Tang Dynasty
- Xian Zong, emperor of the Tang Dynasty (b. 778)
- Theophanes Continuatus, pp. 40–41.