830
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| Years: 826 827 828 829 - 830 - 831 832 833 834 | |
| Decades: 800s 810s 820s - 830s - 840s 850s 860s | |
| Centuries: 8th century - 9th century - 10th century | |
Events
- Christian missionary Ansgar visits Birka, trade city of the Swedes.
- Earliest date of composition for the Historia Brittonum, attributed to Nennius, and known for its list of 12 battles of King Arthur.
- Egbert of Wessex defeats the Welsh.
- Al-Khwarizmi writes the Hisab 'al-jabr' w?al-muqabala, an important work on algebra.
- Borobodur is completed as a Buddhist monument, after about 50 years of work.
Births
- Emperor Koko of Japan (d. 887)
- Carloman, King of Bavaria (d. 880)
Deaths
- Saint Glastian, mediator between Scots and Pictsaf:830
ast:830 bg:830 ca:830 cs:830 de:830 el:830 es:830 eo:830 eu:830 fr:830 ko:830년 hr:830 io:830 it:830 lb:830 hu:830 nl:830 nb:830 nn:830 pl:830 pt:830 ro:830 ru:830 sk:830 sl:830 sr:830 fi:830 sv:830 tt:830 uk:830 zh:830年