He made a vow to lead an army into Palestine against the infidels, and he took on him the cross, in hopes that he should receive from the Church that protection which she tendered to everyone that had entered into this sacred and meritorious engagement. And he sent to Rome his agent, William de Mauclerc, in order to appeal to the Pope against the violence of his barons, and procure him a favorable sentence from that powerful tribunal. The barons, also, were not negligent on their part in endeavoring to engage the Pope in their interests. They despatched Eustace de Vescie to Rome; laid their case before Innocent as their feudal lord, and petitioned him to interpose his authority with the King, and oblige him to restore and confirm all their just and undoubted privileges.
Innocent beheld with regret the disturbances which had arisen in England, and was much inclined to favor John in his pretensions. He had no hopes of retaining and extending his newly acquired superiority over that kingdom, but by supporting so base and degenerate a prince, who was willing to sacrifice every consideration to his present safety; and he foresaw that if the administration should fall into the hands of those gallant and high-spirited barons, they would vindicate the honor, liberty, and independence of the nation, with the same ardor which they now exerted in defence of their own. He wrote letters, therefore, to the prelates, to the nobility, and to the King himself. He exhorted the first to employ their good offices in conciliating peace between the contending parties, and putting an end to civil discord. To the second he expressed his disapprobation of their conduct in employing force to extort concessions from their reluctant sovereign; the last he advised to treat his nobles with grace and indulgence, and to grant them such of their demands as should appear just and reasonable.
The barons easily saw, from the tenor of these letters, that they must reckon on having the Pope, as well as the King, for their adversary; but they had already advanced too far to recede from their pretensions, and their passions were so deeply engaged that it exceeded even the power of superstition itself any longer to control them. They also foresaw that the thunders of Rome, when not seconded by the efforts of the English ecclesiastics, would be of small avail against them; and they perceived that the most considerable of the prelates, as well as all the inferior clergy, professed the highest approbation of their cause. Besides that these men were seized with the national passion for laws and liberty, blessings of which they themselves expected to partake, there concurred very powerful causes to loosen their devoted attachment to the apostolic see. It appeared, from the late usurpations of the Roman Pontiff, that he intended to reap alone all the advantages accruing from that victory, which under his banners, though at their own peril, they had everywhere obtained over the civil magistrate.