830 - Definition and Overview

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