Geoffroi de Villehardouin (c. 1150–c. 1213-1218) was a knight and historian who participated in and chronicled the Fourth Crusade. He is considered one of the most important historians of the time period, best known for writing the eyewitness account De la Conquête de Constantinople (On the Conquest of Constantinople), about the battle for Constantinople between the Christians of the West and the Christians of the East on 13 April 1204. The Conquest is the earliest French historical prose narrative that has survived to modern times. Ηis full title was: “Geoffroi of Villehardouin, Marshal of Champagne and of Romania”
Jean de Joinville (c. May 1, 1224 – 24 December 1317) was one of the great chroniclers of medieval France. He is most famous for writing the Life of Saint Louis, a biography of Louis IX of France that chronicled the Seventh Crusade.