Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: The Fourth Crusade 1204
Fordham University provides a collection of writings about the crusade, covering the Fourth Crusade from its initial events to its conclusion.
Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: Pope Innocent Iii's Summons to a Crusade
The full text of Pope Innocent III's call for yet another crusade. The actual words of the Pope during the year 1215.
Boise State University
History of the Crusades
A class that is available online includes the following Study Units: The Creation of Outremer, Outremer through the Fall of Edessa, Jerusalem Lost, Crusading Fervor, The Last Years and After. Other helpful pages offer timelines, maps,...
Other
Italian Culture: Preparation for the Fourth Crusade
A discussion of the preparation by the Venetians for the Fourth Crusade, along with a discussion of their motives.