The rebellion of Silken Thomas forced Henry VIII. to undertake a determined campaign for the conquest of Ireland. His hopes of winning glory and territory in France had long since disappeared. He was about to break completely with Rome, and there was some reason to fear that Charles V. might make a descent upon the English coasts with or without the aid of the King of France. Were an invasion from the Continent undertaken before the conquest of Ireland had been finished it might result in the complete separation of that kingdom from England, and its transference to some foreign power. It was well known that some of the Irish princes were in close correspondence with France and Scotland, that Silken Thomas was hoping for the assistance of the Emperor, and that once England had separated herself definitely from the Holy See, many of the Irish and Anglo-Irish nobles might be induced to make common cause with the Pope against a heretical king. Hitherto the king's only legal title to the Lordship of Ireland was the supposed grant of Adrian IV., and as such a grant must necessarily lapse on account of heresy and schism a new title must be sought for in the complete conquest of the country. The circumstances were particularly favourable for undertaking such a work. The royal treasury was well supplied; England had little to fear for the time being from Francis I. or Charles V., as the energies of both were required for the terrible struggle between France and the Empire; the friends of Ormond and the enemies of Kildare, both Irish and Anglo- Irish, could be relied upon to lend their aid, and even the Irish princes friendly to Kildare might be conciliated by fair promises of reward. Relying upon all these considerations Henry VIII. determined to reduce Ireland to submission, and at the same time to put an end to its religious and political dependence on the Holy See.