Quarta expeditio sacra
Quarta expeditio sacra ab anno 1203 usque ad 1204 facta est, dirigentibus Bonifacio Montisferrati et Balduino Flandrensi et Henrico Dandulo, Reipublicae Venetae Duce, qui Constantinopolim anno 1204 inter expeditionem sacram ceperunt.

 Imperium Romaniae Latinum
 Ducatus Archipelagi

Fontes rerum in quarta expeditione sacra gestarum 
 Galfridus de Villehardouin, Historia expugnationis Constantinopolitanae
 Robertus de Clari, La conquête de Constantinople
 Gesta Innocentii Papae III
 Nicetas Choniates, Historia
 Devastatio Constantinopolitana

Bibliographia 
 Angold, Michael The Fourth Crusade: Event and Context. Harlow: Longman, 2003.
 Joseph Gill, "Innocent III and the Greeks: aggressor or apostle?" in Derek Baker, ed., Relations between East and West in the Middle Ages (Edimburgi, 1971) pp. 95-108
 Harris, Jonathan Byzantium and the Crusades. London: Hambledon, 2003.
 Gherardo Ortalli, Giorgio Ravegnani, Peter Schreiner, edd., Quarta Crociata: Venezia, Bisanzio, Impero Latino. Venetiis: Istituto Veneto di Scienze, Lettere ed Arte, 2006. 2 voll.
 Phillips, Jonathan The Fourth Crusade and the Sack of Constantinople London: Pimlico, 2005
 Queller, Donald E. The Latin Conquest of Constantinople. New York: Wiley, 1971
 Steven Runciman, A History of the Crusades (Cantabrigiae: Cambridge University Press, 1952–1955) vol. 3
 

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Innocentius III
Historia Constantinopolis