* 1204 – The Crusaders of the Fourth Crusade breach the walls of Constantinople and enter the city, which they completely occupy the following day.

* 1204 – Eleanor of Aquitaine ( b. 1122 )

* 1204 – Constantinople falls to the Crusaders of the Fourth Crusade, temporarily ending the Byzantine Empire.

* Michael Angold ( 1997 ), The Byzantine Empire, 1025 – 1204, Longman, 2nd ed., pp. 136 – 70.

* Michael Angold, The Byzantine Empire, 1025 – 1204: A Political History, second edition ( London and New York, 1997 )

Alexios V Doukas, surnamed Mourtzouphlos (, d. December 1205, Constantinople ) was Byzantine Emperor ( 5 February – 12 April 1204 ) during the second and final siege of Constantinople by the participants of the Fourth Crusade.

* Anna Maria of Hungary ( c. 1204 – 1237 ), wife of Tzar Ivan Asen II of Bulgaria

The Byzantine Empire, 1025 – 1204.

* 1263 – King Haakon IV of Norway ( b. 1204 )

* 1204 – Abû ' Uthmân Sa ' îd ibn Hakam al Qurashi, ruler of Minorca ( d. 1282 )

* 1204 – Maimonides, Spanish rabbi and philosopher ( b. 1135 )

Eleanor of Aquitaine () ( 1122 or 1124 – 1 April 1204 ) was one of the wealthiest and most powerful women in Western Europe during the High Middle Ages.

* 1192 – 1200 / 1204: Frederick I ( also count of Zollern as Frederick III )

* 1204 – 1218: Frederick II ( son of, also count of Zollern as Frederick IV )

* The Mishneh Torah ( also known as the Yad HaHazaka for its 14 volumes ; " yad " has a numeric value of 14 ), by Maimonides ( Rambam ; 1135 – 1204 ).

* 1204 – King Philip Augustus of France conquers Rouen.

Maimonides ( 1135 – 1204 CE ) relates that until the Babylonian exile ( 586 BCE ), all Jews composed their own prayers, but thereafter the sages of the Great Assembly composed the main portions of the siddur.

Byzantine empresses: women and power in Byzantium, AD 527 – 1204.

The Charte aux Normands granted by Louis X of France in 1315 ( and later re-confirmed in 1339 ) – like the analogous Magna Carta granted in England in the aftermath of 1204 – guaranteed the liberties and privileges of the province of Normandy.

* 1182 – Minamoto no Yoriie, Japanese shogun ( d. 1204 )

* " Historical Dynamics in a Time of Crisis: Late Byzantium, 1204 – 1453 " ( discussion of social dynamics from the point of view of historical studies )

* Heinrich of Klingen ( 1200 – 1204 )

Marie was regent for Baldwin for the two years she remained in Flanders and Hainaut, but by early 1204, she had left both her children behind to join him in the East.

In this enterprise in the summer of 1204, Baldwin came into collision with Boniface of Montferrat, the rival candidate for the empire, who was to receive a large territory in Macedonia with the title of King of Thessalonica.

Baldwin IX, Count of Flanders, was crowned the first Latin emperor as Baldwin I on 16 May 1204.

* Marie of Champagne ( died 1204 ), married Baldwin I of Constantinople

After the conquest of the Byzantine Empire in 1204 he served as a military leader, and led the retreat from the Battle of Adrianople in 1205 after Baldwin I was captured by the forces of the Second Bulgarian Empire.

Immediately afterwards, in 1204, the Fourth Crusade captured Constantinople and created the Latin Empire, electing as emperor Baldwin I of Flanders.

Theodore and Anna married, on the urging of the Latin Emperor Baldwin I of Constantinople, immediately after the establishment of the Latin Empire in summer 1204.

Theodore Lascaris was not immediately successful, as he was defeated at Poemanenum and Prusa ( now Bursa ) in 1204, but he was able to capture much of northwestern Anatolia after the Latin Emperor Baldwin I had to defend against invasions from Kaloyan of Bulgaria.

He then went on to capture the city later in 1204 and set up a kingdom there, subordinate to Baldwin, although the title of " king " was never officially used.

Marie of Champagne ( – 9 August 1204 ) was the Empress consort of Baldwin I of Constantinople.

On 9 May 1204, Baldwin was elected its first emperor making Marie the empress consort.

* Marie of Champagne ( died 1204 ), married Baldwin I of Constantinople

# Baldwin ( died 1204 ).

Anna and Theodore eventually married, at the urging of the Latin emperor Baldwin I of Constantinople, in summer 1204.

In 1204, the region was conquered by Philip II and an enormous castle was built during the minority of his grandson, Louis IX (" Saint Louis ") in the early part of the 13th century.

The cloth disappeared from Constantinople during the Fourth Crusade of Constantinople in 1204, reappearing as a relic in King Louis IX of France's Sainte Chapelle in Paris.

* William IX of Montpellier 1202 – 1204

Prose compositions in the Middle Ages — other than the prose versions of romances and " chansons de geste " -- include a number of histories and chronicles, of which the most famous are those of Robert de Clari and Geoffroy de Villehardouin ( both on the Fourth crusade of 1204 and the capture of Constantinople ), Jean de Joinville ( on Saint Louis IX of France ), Jean Froissart ( on the wars of the 14th century ) and Philippe de Commines and Enguerrand de Monstrelet ( on the troubles of the 15th century ).

Agnes Maria of Andechs-Merania ( died 1201 ), queen of France, was the daughter of Bertold IV ( died 1204 ), who was Count of Andechs, a castle and territory near Ammersee, Bavaria and from 1183 duke of Merania ( Istria ).

** Richenza ( 1172 – 1204 ), also called Matilda, married Godfrey, Count of Perche, and Enguerrand III, Lord of Coucy

It is assumed that Boskoop originated from the settlement Ten Bussche, founded by William I, Count of Holland, in 1204.

* Alix ( 1204 – 1266 ) married Robert I ( died 1262 ) Count of Clermont et Dauphin of Auvergne