It was the financial difficulties of the government which had chiefly prevented the success of this war. The opposition to Hubert de Burgh was constant, and it had only been upon condition of again signing the Charter that the King had been able to raise a fifteenth for the French war. This tax was probably the first raised in strict accordance with the terms of the Charter. De Burgh was honestly desirous, in opposition to the arbitrary views of his rival Des Roches, that the King should rule constitutionally, and both by proclamation and by official letters he took care to spread a knowledge of the Charter in the country. Although Henry was declared of age in 1227, when he was twenty, the government of De Burgh practically continued. He was made Earl of Kent, and declared Justiciary for life; and his victory was completed by the absence of Peter des Roches, who thought it better to withdraw for a time to the Crusades. His rule was not very popular among the nobles: not only was he naturally disliked by the chiefs of the adverse party, he even quarrelled with Richard, the King’s brother, and with William Marshall. Such an act indeed as the following could scarcely have failed to make him enemies. An inquisition was issued to examine into the title deeds[35] of all tenants in chief, who were obliged to make good their titles by large payments. The sum derived from this inquiry amounted to £100,000. [Sidenote: Langton supports his policy.] [Sidenote: Change of Popes: increased exactions.]