1018Centuries: 10th century - 11th century - 12th century
- Bulgaria becomes part of the Byzantine Empire.
- Peace of Bautzen between Poland and Germany.
- Boleslaus I of Poland conquers Red Ruthenia.
- Battle of Carham: The Scots conquer Lothian.
- Northumberland becomes part of Scotland.
- De facto end of the independence of Strathclyde.
- Canute the Great becomes king of Denmark (or 1019), succeeding Harold II.
- Battle of Vlaardingen: Count Dirk III defeats an army sent by Emperor Henry II at Vlaardingen.
- Buckfast Abbey founded.
- The city of Koblenz is given to the archbishop of Trier.