The hard rule of the Norman nobles caused many secret assassinations. To put a stop to these crimes, William enacted the Law of Englishry. It compelled the people of the district where a murder was perpetrated to pay a heavy fine for every Norman so slain; for it was assumed that every man found murdered was a Norman, unless proof could be brought to the contrary. While these events were taking place in England, Hildebrand, the archdeacon who had urged the Pope to favor William's expedition against England (S68), ascended the papal throne, under the title of Gregory VII. He was the ablest, the most ambitious, and, in some respects, he most farsighted man who had been elected supreme head of the Catholic Church. 117. State of Europe; Gregory's Scheme of Reform. Europe was at that time in a condition little better than anarchy. A perpetual quarrel was going on between the feudal barons. The Church, too, as we have seen (SS53, 60), had temporarily lost much of its power for good. Pope Gregory conceived a scheme of reform which he intended should be both wide and deep. Like Dunstan (S60), he determined to correct the abuses which had crept into the monasteries. He resolved to have a priesthood who should devote themselves body and soul to the interests of the Church; he resolved to bring all society into submission to that priesthood; finally, he resolved to make the priesthood itself acknowledge him as its sole master. His purpose in this gigantic scheme was a noble one; it was to establish the unity and peace of Europe. 118. The Pope and the Conqueror, 1076. Pope Gregory looked to William for help in this matter. The Conqueror, who was a zealous Catholic, was ready to give that help, but with limitations. He pledged himself to aid in reforming the English Church, which had enjoyed "an insular and barbaric independence." He undertook to remove inefficient men from its high places. The King also agreed to do something that had never been done before in England, namely, to establish separate courts (S151) for the trial of Church cases (SS164, 165). Finally, he agreed to pay the customary yearly tax to Rome, called "Peter's pence." But Pope Gregory was not satisfied. He demanded that the Conqueror should do him homage for his crown, and should swear "to become his man" (S86). This William respectfully, but decidedly, refused to do, saying that as no "King of the English before him had ever become the Pope's man, so neither would he." In taking this action the King declared himself to be an obedient and affectionate son of the "Holy Catholic Church." But at the same time he laid down these three rules to show that he would not tolerate any interference with his power as an independent English sovereign: