Representation of the Catholic Church as The Fortress of Faith. The defending forces of the Christian faith. Besieged by the impious and heretics, it is defended by the Pope, the bishops, the monks, and the Doctors of the Church, who are the knights of the faith. Chromolithography from a 15th-century miniature. Detail. "Vie Militaire et Religieuse au Moyen age et a lEpoque de la Renaissance. Paris, 1877.