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This article is about the year 1203.
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1170s 1180s 1190s – 1200s – 1210s 1220s 1230s|
|Years:||1200 1201 1202 – 1203 – 1204 1205 1206|
|1203 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1203 in poetry|
|Ab urbe condita||1956|
|English Regnal year||4 Joh. 1 – 5 Joh. 1|
|Chinese calendar||壬戌年 (Water Dog)
3899 or 3839
— to —
癸亥年 (Water Pig)
3900 or 3840
|- Vikram Samvat||1259–1260|
|- Shaka Samvat||1125–1126|
|- Kali Yuga||4304–4305|
|Japanese calendar||Kennin 3
|Minguo calendar||709 before ROC
|Thai solar calendar||1745–1746|
|Wikimedia Commons has media related to 1203.|
Year 1203 (MCCIII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. It was also the first year to have all digits different from each other since 1098.
- April 16 – Philip II of France enters Rouen, leading to the eventual unification of Normandy and France.
- William de Braose, 4th Lord of Bramber becomes the guardian of Arthur I, Duke of Brittany, and is possibly responsible for his death.
- Battle of Basiani: The Georgians defeat a Muslim coalition.
- The Almohads begin the conquest of the Balearic Islands.
- The troops of the Fourth Crusade reach the Byzantine heartland:
- June 23 – The Fleet of the crusaders enters the Bosphorus.
- July 17 – The armies of the Fourth Crusade capture Constantinople by assault; the Byzantine emperor Alexios III Angelos flees from his capital into exile.
- August 1 – The Fourth Crusade elevates Alexios IV Angelos as Byzantine emperor, after the citizens of Constantinople proclaim as emperor Isaac II Angelos (Alexius IV's father).
- First evidence that the Temple in London is extending loans to the king of England. The sums remained relatively small but were often used for critical operations such as the ransoming of the king’s soldiers captured by the French.
- April 8 – Congress of Bilino Polje: Ban Kulin officially declares his allegiance to the Roman Catholic Church and denounces heresy.
- The Temple of Nataraja is completed at Chidambaram in India.
- Foundation of the Benedictine abbey of Iona by Ragnall mac Somairle on previous Columban site.
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- May - Dafydd ab Owain Gwynedd, King of Gwynedd
- date unknown - Alexios Palaiologos, Byzantine heir apparent
- probable - Arthur I, Duke of Brittany (b. 1187)
- Ferris, Eleanor (1902). "The Financial Relations of the Knights Templars to the English Crown". American Historical Review 8 (1).