In handling the crisis raising by the bellicose and violent knights, the attention of ‘the just war’ and also, ‘the saint war’ has been continually caught by the unarmed, in the 11th and 12th centuries. It was very urgent for the unarmed to resolve the expansion of the feudal seigneurs and knights. To deal with the complicated circumstances, the many theologians and monks have tried to suggest not only the legitimate and just war but the ideal type of knight. It is given to the two excellent representatives, Orderic Vital and Saint Bernard, in proposing the ideal type of knight, what we called, militia Christi, and in presenting the way to be the soldiers of God in the 11th and 12th centuries.
As a monk of the Saint Evroul in Normandy, Orderic Vital has furnished the precious informations, about the knights including the kings of England and France, through his Historia ecclesiasticae with religious passion. Also, Saint Bernard, who was abbot in the abbey of Clairvaux and the famous theologian, has provided the new knighthood and the way of doing through his De laude novae militiae with the invitation to the second crusade. In spite of common view, between Orderic Vital and Saint Bernard, concerning in the mission of the solider of God, militia Christi, we can find the difference between them. To the chronicler of Historia ecclesiasticae , Orderic Vital, it is the first priority in inviting the knight to the monastic life to become the ideal type of knight. Contrastively, it is very important for Saint Bernard to participating in the second crusade as the way to realize the ideal type of knight. It is very difficult to define the ideal type of knight in the 11th and 12th centuries. But it is said that the ideal type of knight, proposed by Orderic Vital and Saint Bernard, protects the Church and the christianism against the paganism as well as observes to the ecclesiastical indoctrination.