The better to unite the parts of the government, and to bind them into one system, which might serve both for defence against foreigners, and for the support of domestic tranquillity, William reduced the ecclesiastical revenues under the same feudal law; and though he had courted the church on his invasion and accession, he now subjected it to services which the clergy regarded as a grievous slavery, and as totally unbefitting their profession. The bishops and abbots were obliged, when required, to furnish to the king, during war, a number of knights, or military tenants, proportioned to the extent of property possessed by each see or abbey; and they were liable, in case of failure, to the same penalties which were exacted from the laity [d] The pope and the ecclesiastics exclaimed against this tyranny, as they called it; but the king's authority was so well established over the army, who held every thing from his bounty, that superstition itself, even in that age, when it was most prevalent, was constrained to bend under his superior influence. [FN [d] M. Paris, p. 5. Anglia Sacra, vol. i. p. 248.] But as the great body of the clergy were still natives, the king had much reason to dread the effects of their resentment; he therefore used the precaution of expelling the English from all the considerable dignities, and of advancing foreigners in their place. The partiality of the Confessor towards the Normans had been so great, that, aided by their superior learning, it had promoted them to many of the sees in England; and even before the period of the Conquest, scarcely more than six or seven of the prelates were natives of the country. But among these was Stigand, Archbishop of Canterbury; a man who, by his address and vigour, by the greatness of his family and alliances, by the extent of his possessions, as well as by the dignity of his office, and his authority among the English, gave jealousy to the king [e]. Though William had, on his accession, affronted this prelate by employing the Archbishop of York to officiate at his consecration, he was careful on other occasions to load hint with honours and caresses, and to avoid giving him farther offence till the opportunity should offer of effecting his final destruction [f]. The suppression of the late rebellions, and the total subjection of the English, made him hope that an attempt against Stigand, however violent, would be covered by his great successes, and be overlooked amidst the other important revolutions which affected so deeply the property and liberty of the kingdom. Yet, notwithstanding these great advantages, he did not think it safe to violate the reverence usually paid to the primate; but under cover of a new superstition, which he was the great instrument of introducing into England. [FN [e] Parker, p. 161. [f] Ibid. p. 164.]