The work of Geoffroy de Villehardouin, “The Conquest of Constantinople,” created around 1210, along with the work of the same name by the Picardy knight Robert de Clary, is a first-class source of factual information about the scandalous Fourth Crusade of 1198-1204 in medieval history. As is known, this campaign ended with the predatory seizure of the capital of Christian Byzantium by the knights-crusaders in 1203-1204. Perhaps none of the contemporary chroniclers, who in one way or another wrote about the events that led to the death of the Greek kingdom, preserved such an abundant and complete in terms of its detail and thoroughness of factual material regarding the actually occurring vicissitudes of what was at that time a grandiose “international” knightly adventure and its immediate consequences for the countries of the Balkan Peninsula, like Geoffroy de Villehardouin. CONTENTS: Conquest of Constantinople (5). APPENDICES “Conquest of Constantinople” by Geoffroy de Villehardouin and historical thought of the Middle Ages (128). Notes (218). Basic literature. Editions and translations of the chronicle of Geoffrey de Villehardouin (288). Index of names (Yu.R. Ulyanov) (291).