* 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 – 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.

* 1204 – Baldwin IX, Count of Flanders is crowned as the first Emperor of the Latin Empire.

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 )

* Ban Kulin, ruler of Bosnia ( d. 1204 )

* To appoint a de facto ruler in cases where the king was a minor or seriously ill ( e. g. Håkon galen in 1204 during the minority of king Guttorm, Skule Bårdsson in 1217 during the illness of king Inge Bårdsson ).

After the Fourth Crusade in 1204, a Byzantine successor state was founded there with support of Queen Tamar of Georgia, the Empire of Trebizond, which ruled part of the Black Sea coast from Trebizond until 1461, when its ruler, David, surrendered to Mehmed II, ruler of the Ottoman Empire.

In 1204, Sabas Asidenos, a local magnate, established himself as the city's ruler, but soon had to recognize the rule of the Empire of Nicaea.

England and Normandy remained under a single ruler until 1204.

In the chaos that followed, and using Vukans's sympaties for Catholicism against him, Stefan managed to return to Serbia and overthrow Vukan in 1204 becoming ruler again.

* Maimonides, Spanish rabbi and philosopher ( d. 1204 )

* Eleanor of Aquitaine, Queen of France and England ( approximate date ) ( d. 1204 )

* King Guttorm of Norway ( d. 1204 )

* March 28 – Maimonides, Spanish rabbi and philosopher ( d. 1204 )

* Emeric of Hungary ( d. 1204 )

* September 11 – Minamoto no Yoriie, Japanese shogun ( d. 1204 )

* Nicola de Romanis ( d. 1219 ) ( 1204, 1211 )

* Nivelon d ' Arras ( died 1204 ), Marshal of France in 1202

## Alix de Poitiers ( died 1233 ), married 1204 Guy I Embriaco, lord of Gibelet ( d. ca 1233 )

The literal message of the work was repulsive to those who maintained God's incorporeality ; Maimonides ( d. 1204 ) wrote that the book should be erased and all mention of its existence deleted.

* Alexios V Doukas ( Ἀλέξιος Δούκας Μούρτζουφλος, d. December 1205 ) was Byzantine emperor ( 5 February – 12 April 1204 ) during the second and final siege of Constantinople by the participants of the Fourth Crusade.

* Helena Vsevolodovna ( d. 1204 ).

His second son was Godfrey de Luci ( d. 1204 ), Bishop of Winchester.

: Mabel de Clare, d. 1204, m. ( c. 1175 ), Nigel de Mowbray.

: Eveline ( Aveline ) de Clare, d. 4 June 1225, m. ( c. 1204 ), Geoffrey IV Fitz Piers ( Fitz Peter ), 1st Earl of Essex.

Pioneer scholars such as Ibn Maimun ( Maimonides ), ( 1135 – 1204 ), Al-Idrissi ( d. 1166 AD ), Ibn al-Arabi ( 1165-1240 AD ), Ibn Khaldun ( 1332-1395 AD ), Ibn al-Khatib, Al-Bitruji ( Alpetragius ), Ibn Hirzihim, and Al-Wazzan were all connected with the madrasa either as students or lecturers.

In Jewish tradition, Saadiah ( d. 942 ), Ibn Ezra ( d. circa 1164 ), Maimonides ( 1135 – 1204 ) and Obadiah ben Abraham ( 1465-1515 ) identified the ezov mentioned in the Hebrew Bible with the Arabic word " za ' atar ".