|1203 by topic|
|Political entities - State leaders - Religious leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1203 in poetry|
|Ab urbe condita||1956|
|Balinese saka calendar||1124–1125|
|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||1124–1125|
|- Kali Yuga||4303–4304|
|Japanese calendar||Kennin 3
|Minguo calendar||709 before ROC
|Thai solar calendar||1745–1746|
1329 or 948 or 176
— to —
1330 or 949 or 177
|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.
- The House of Burke is founded in Ireland.
- 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).
- The Oeselians ravage Danish Scania. The returning pirates later skirmish with the German settlers of Riga, near Visby in Gotland.
- The first evidence is revealed, that the Temple in London is extending loans to the king of England. The sums remain relatively small, but are 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.
- The Benedictine abbey of Iona is founded by Ragnall mac Somairle, on a previous Columban site.
- Peter II, Count of Savoy (d. 1268)
- Eva Marshal, Norman noble (d. 1246)
- Ibn Abi Usaibia, Syrian Arab medical historian (d. 1270)
- May - Dafydd ab Owain Gwynedd, King of Gwynedd
- Agnes II, Abbess of Quedlinburg (b. 1139)
- 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).