A weapon of great value in the enforcement of ecclesiastical demands was that of excommunication and anathema. This was considered to correspond to the death penalty of the Mosaic law, the employment of the sword of the Spirit. If, however, the fear of excommunication was insufficient to gain from a reluctant monarch respect for the wishes of the Church, then the power of deposition was resorted to. The authority to do this was based on the power claimed by the Church of absolving their members from the oaths of allegiance they had taken. This power was of special significance in a feudal state of society, at a time when the tendency to renounce allegiance was continually present and opportunity and pretext alone lacking. The Norman Conquest not only intensified the development of the Feudal System in this country, but it also contributed largely to the recognition of the separate power of the Church. The Conquest had resulted in the administration of the country passing under the control of men who were "better managers, keener, more unscrupulous, less drunken and quarrelsome, better trained, hardier, thriftier, more in sympathy with the general European movements, more adventurous, more temperate.... The result was inevitably better organisation, quicker progress, great exactions and oppressions in Church and State."[118] Moreover, the invasion had claimed to possess a religious character and to have for its object the regaining of an heritage which had been "filched by a perjured usurper." The existing archbishops, bishops, and abbots fled or were deprived of their positions, and their places were filled, generally but not always, by men of foreign race. These men were not merely ecclesiastics, but were feudal lords in addition, and the temporal possessions they held in virtue of their dignities were not only considerable in themselves but, owing to various causes, were continually increasing. The clergy were thus in possession of increasing powers and additional interests, separate from and independent of the rest of their countrymen. The tendency was more and more marked for the Church to become conscious of her temporal powers, to feel jealous of her privileges, and insistent upon her rights.