French soldier, chronicler, marshal of Champagne, and one of the leaders of the Fourth Crusade (1201–04), which he described in his Conquest of Constantinople. He was the first serious writer of an original prose history in Old French.

Although he was only one of the lesser nobility, Villehardouin was from the start accepted as one of the leaders of the Fourth Crusade (Crusades). In 1205 his consummate generalship saved the Frankish army from destruction at the hands of the Bulgars outside Adrianople (modern Edirne, Turkey) and led them without loss through hostile country to safety in Constantinople.

Villehardouin's work, usually known as the Conquête de Constantinople (Conquest of Constantinople), initiated the great series of histories that so distinguishes medieval French literature. His achievement is remarkable because neither in style nor form did he have any models on which to base his work; his Latin predecessors were probably unknown to him firsthand. He probably started writing his chronicle about 1209. In it, he describes the “crusade,” a war in which French knights and their Venetian allies invaded the Byzantine Empire and captured its capital Constantinople (1204). It was after the city's fall that Villehardouin distinguished himself in the conflict with the Bulgars.