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Centuries: 8th century - 9th century - 10th century Decades: 780s 790s 800s 810s 820s - 830s - 840s 850s 860s 870s 880s Years: 825 826 827 828 829 - 830 - 831 832 833 834 835 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 Carloman, King of Bavaria Deaths Saint Glastian[?], mediator between Scots and Picts
Centuries: 8th century - 9th century - 10th century
Decades: 780s 790s 800s 810s 820s - 830s - 840s 850s 860s 870s 880s
Years: 825 826 827 828 829 - 830 - 831 832 833 834 835
Births
Deaths