1003 (MIII) was a common year when the Julian calendar was used. It was the third year of the 2nd millennium and the 11th century.
Events
Sweyn I of Denmark begins his first invasion of England. Humbert I becomes the first count of Savoy. King Robert II of France invades Burgundy, but fails. Pope John XVII succeeds Pope Silvester II. Pope John XVIII succeeds Pope John XVII. Boleslaus I of Poland becomes duke of Bohemia and Moravia. Battle of Albesa: Muslim forces of the Caliphate of Cordoba defeat the northern Christian armies of León, Pamplona and Castile.
Births
c.December 25 – Edward the Confessor, King of England and founder of Westminster Abbey in London (died 1066) date unknown Prince Louis of France, French royal (died 1028)