820
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|
| Years: 816 817 818 819 - 820 - 821 822 823 824 | |
| Decades: 790s 800s 810s - 820s - 830s 840s 850s | |
| Centuries: 8th century - 9th century - 10th century | |
Events
- Persian scientist Khwarizmi founded algebra.
- Michael II succeeds Leo V as Byzantine Emperor
- The Historia Brittonum is written (approximate date)
- Feidlimid mac Cremthanin assumes the Kingship of Munster
Births
- Rhodri Mawr ('the Great'), ruler of Gwynedd (Wales) (approximate date) (d. 878)
- Photius I, Patriarch of Constantinople (approximate date) (d. 891)
Deaths
- December 24 - Leo V, Byzantine Emperor (b. 775)(assassinated)
- Tang Xian Zong, emperor of China (end of reign)af:820
ast:820 bg:820 ca:820 cs:820 de:820 el:820 es:820 eo:820 eu:820 fr:820 ko:820년 hr:820 io:820 it:820 lb:820 hu:820 nl:820 nb:820 nn:820 pl:820 pt:820 ro:820 ru:820 sk:820 sl:820 sr:820 fi:820 sv:820 tt:820 uk:820 zh:820年