830

align="center" colspan=2 | Years:
826 827 828 829 - 830 - 831 832 833 834

align="center" colspan=2 | Decades:
800s 810s 820s - 830s - 840s 850s 860s

align="center" | 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

Deaths

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