History
825
General
Population: 225 Million*
- Mathematics: Al-Khowarizmi publishes Algebra
Asia
- China: Chinese develop chamber lock on canals
- Japan: Japan imports Buddhist paintings of the T'ang era from China
Europe
- Crete: Saracen Arabs in Crete
- England: Battle of Ellandum – Mercia defeated by Egbert
- German States: Pavia becomes center of science and literature
- Ireland: End of famine