During the twelfth century, the knights were regarded as a professional group. By the end of the century, there was undoubtedly 'a warrior order', that is, the knights. In the technical domain, a number of innovations profoundly modified the art of war and conferred on the knights a greater pre-eminence. All these factors created or accelerated the trend towards the formation of a knightly society which was aware of it and produced its own ideology. Knightly society included all who, at different levels, participated in the ban within the framework of the political seigneurie, of which the castle constituted both the symbol and the base. During the thirteenth century, that the feudal and knightly model penetrated the empire and there assumed aspects of an ideological veneer. The knightly class formed was distinguished from the other warriors by equipment, methods of fighting and training, the way of life and manners and an ethic and an ideology, known as 'chivalric'.