Crusades. Embarkation of knights of the Order of the Holy Spirit to the Holy Land. Knights had to be willing to submit to the Roman Church whenever it ordered them to do so. Chromolithography after a miniature from the statutes of the Order of the Holy Spirit in Naples, 14th century. "Vie Militaire et Religieuse au Moyen Age et a lEpoque de la Renaissance". Paris, 1877.