1204

Millennium:	2nd millennium
Centuries:	12th century – 13th century – 14th century
Decades:	1170s 1180s 1190s – 1200s – 1210s 1220s 1230s
Years:	1201 1202 1203 – 1204 – 1205 1206 1207

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1204 (MCCIV) was a leap year starting on Thursday of the Julian calendar, the 1204th year of the Common Era (CE) and Anno Domini (AD) designations, the 204th year of the 2nd millennium, the 4th year of the 13th century, and the 5th year of the 1200s decade.

Events

February – Byzantine emperor Alexius IV is overthrown in a revolution, and Alexius V is proclaimed emperor.
April 12 – The Fourth Crusade take Constantinople by storm, and pillage the city for three days. End of the Fourth Crusade.
May 16 – Baldwin, Count of Flanders is crowned emperor of the Latin Empire a week after his election by the members of the Fourth Crusade.
Theodore I Lascaris flees to Nicaea after the capture of Constantinople, and establishes the Empire of Nicaea; Byzantine successor states are also established in Epirus and Trebizond.
Boniface of Montferrat, a leader of the Fourth Crusade, founds the Kingdom of Thessalonica.
The writings of French theologian Amalric of Bena are condemned by the University of Paris and Pope Innocent III.
Valdemar II, King of Denmark, is recognized as king in Norway.
Angers and Normandy are recaptured from England by Philip II of France.
The Cistercian convent of Port-Royal is established.
The district of Cham becomes subject to Bavaria.
Philip of Swabia becomes a subject of Hermann I of Thuringia.
Beaulieu Abbey founded.
Jersey enjoys self-government thanks to the division of the Duchy of Normandy.