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This article is about the year 1003. For the number, see 1003 (number).
|Centuries:||10th century – 11th century – 12th century|
|Decades:||970s 980s 990s – 1000s – 1010s 1020s 1030s|
|Years:||1000 1001 1002 – 1003 – 1004 1005 1006|
|1003 by topic|
|Lists of leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1756|
|English Regnal year||N/A|
|Chinese calendar||壬寅年 (Water Tiger)
3699 or 3639
— to —
癸卯年 (Water Rabbit)
3700 or 3640
|- Vikram Samvat||1059–1060|
|- Shaka Samvat||925–926|
|- Kali Yuga||4104–4105|
|Japanese calendar||Chōhō 5
|Minguo calendar||909 before ROC
|Seleucid era||1314/1315 AG|
|Thai solar calendar||1545–1546|
|Wikimedia Commons has media related to 1003.|
- January 25 – Werner, Margrave of the Nordmark succeeds Lothair.
- February 9 – Boleslaus III of Bohemia is restored to authority with armed support from Bolesław I the Brave of Poland. In the following months Boleslav's brothers Jaromir and Oldrich flee to Germany and place themselves under the protection of Henry II, Holy Roman Emperor, while Boleslaus III of Bohemia orders massacre of his leading nobles at Vyšehrad.
- May 4 – Herman III, Duke of Swabia succeeds Herman II.
- Vladivoj of Bohemia succeeds Boleslaus III
- Boleslaus IV succeeds Vladivoj of Bohemia.
- Bolesław I of Poland annexes parts of present-day Slovakia (possible date).
- Wilfred succeeds Abbot Oliva as count of Berga.
- 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.
- Robert II of France marries Constance of Arles.
- Boleslaus I of Poland becomes duke of Bohemia and Moravia.
- Stephen I of Hungary invades Transylvania and organises the Diocese of Transylvania (possible date).
- Deutz Abbey is founded at Deutz by Heribert of Cologne.
- The troops of the Caliphate of Cordoba defeats the northern Christian armies at the battle of Albesa.
- The construction of Brihadeeswarar temple, Thanjavur, Tamil Nadu, India, starts. Chola Dynasty, Early Medieval period.
- May 16 – Pope John XVII succeeds Pope Silvester II as the 140th pope.
- December 25 – Pope John XVIII succeeds Pope John XVII as the 141st pope.
- Advisa, Countess of Auxerre, (approximate date; d.after 1063), married Count Renaud I of Nevers
- Conrad II, Duke of Carinthia (d. 1039)
- Edward the Confessor (approximate date) (d. 1066)
- Emperor Jingzong of Western Xia
- Frederick, Duke of Lower Lorraine (approximate date; d. 1065
- Herleva, mother of William I of England (d. c. 1050)
- Ibn Zaydún, Arabic poet (d. 1071)
- Musharrif al-Daula, Buyid amir of Iraq (d. 1025)
- January 25 – Lothair, Margrave of the Nordmark
- February 7 – Rozala, Queen of France in 996
- May 4 – Herman II, Duke of Swabia
- May 12 – Pope Silvester II
- November 6 – Pope John XVII
- December 27 – Emma of Blois, Duchess and Regent of Aquitaine
- At-Ta'i, the Abbasid Caliph in Baghdad from 974 to 991
- Erik the Red
- Gregory of Narek, Armenia poet, philosopher and theologian
- Philotheos of Alexandria, Coptic Patriarch
- Vladivoj of Bohemia
- Boissonade, B. "Les premières croisades françaises en Espagne. Normands, Gascons, Aquitains et Bourguignons (1018-1032)". Bulletin Hispanique 36 (1): 5–28. doi:10.3406/hispa.1934.2607.