From Infogalactic: the planetary knowledge core
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1170s 1180s 1190s – 1200s – 1210s 1220s 1230s|
|Years:||1201 1202 1203 – 1204 – 1205 1206 1207|
|1204 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1204 in poetry|
|Ab urbe condita||1957|
|English Regnal year||5 Joh. 1 – 6 Joh. 1|
|Chinese calendar||癸亥年 (Water Pig)
3900 or 3840
— to —
甲子年 (Wood Rat)
3901 or 3841
|- Vikram Samvat||1260–1261|
|- Shaka Samvat||1126–1127|
|- Kali Yuga||4305–4306|
|Japanese calendar||Kennin 4 / Genkyū 1
|Minguo calendar||708 before ROC
|Thai solar calendar||1746–1747|
|Wikimedia Commons has media related to 1204.|
- January – Four-year-old Guttorm is proclaimed King of Norway; his "reign" ends with his death a few months later.
- January 28 – Byzantine emperor Alexios IV Angelos is overthrown in a revolution.
- February 5 – Alexios V Doukas is proclaimed Byzantine emperor.
- April 13 – Fourth Crusade: The Crusaders take Constantinople by storm, and pillage the city for 3 days. Forces of the Republic of Venice seize the antique statues that will become the horses of Saint Mark.
- 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 Laskaris 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 I, Marquess 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.
- Tsar Kaloyan is recognized as king of Bulgaria by Pope Innocent III after the creation of the Bulgarian Uniate church.
- Valdemar II of Denmark, is recognized as king in Norway.
- Angers and Normandy are captured by Philip II of France.
- The Cistercian convent of Port-Royal-des-Champs is established.
- The district of Cham becomes subject to Bavaria.
- Hermann I, Landgrave of Thuringia submits to Philip of Swabia.
- Beaulieu Abbey is founded.
- The Channel Islands of Guernsey and Jersey decide, after a plebiscite of wealthy land owners, to remain with the English crown after Normandy is recaptured by Philip II of France.
- Haakon IV of Norway (d. 1263)
- Henry Raspe, Landgrave of Thuringia (d. 1247)
- Abû 'Uthmân Sa'îd ibn Hakam al Qurashi, Ra'îs of Manûrqa (d. 1282)
- Alice of Schaerbeek (d. 1250)
- January 1 – King Haakon III of Norway
- January – Isaac II Angelos, Byzantine emperor
- February 8 – Alexios IV Angelos, Byzantine emperor
- April 1 – Eleanor of Aquitaine, queen of France and England
- August 11 – King Guttorm of Norway
- August 14 – Minamoto no Yoriie, Japanese shogun (b. 1182)
- September 30 (or November 30) – Emeric, King of Hungary (b. 1174)
- October 21 – Robert de Beaumont, 4th Earl of Leicester, English nobleman
- December 13 – Maimonides, Spanish rabbi and philosopher (b. 1135)
- Ban Kulin, ruler of Bosnia (b. 1163)
- date unknown – Suleiman II of Rum
- probable – Amalric of Bena, French theologian