Hope was probably stimulated in the empire by the fact that the pope and the West generally seemed at last to recognise that, in their own interest, measures should be taken to defend the empire. Moreover, the danger was now so pressing, not only to the Greeks but to Europe, that it appeared possible to obtain aid without submitting to the humiliating conditions hitherto imposed. While John knew that to persuade the Orthodox Church to acknowledge any of its doctrines as heretical, and especially to induce the ecclesiastics to accept the supremacy of the pope, was almost impossible, he professed himself ready to make his own submission. The Union of the Churches could be accomplished at a later day. There appeared reason to hope that the pope regarded the danger from the Moslems mainly from the statesman’s point of view and desired mutual action. John was so far justified in this hope that it may be confidently asserted that had the counsels of more than one of the popes during his reign been followed there would have been a concerted action against the common enemy sufficient to have delayed the Turkish progress, and possibly to have altogether arrested it. We shall see, however, that, although all the states of Western Europe still acknowledged the supremacy of the pope, their interests and jealousies were as diverse as they have been in modern times, and that the pontiff was able neither to induce nor to compel the nations acknowledging his supremacy to act in concert. Knowing from his own visit to Italy and from the negotiations carried on by Cantacuzenus that Rome was predisposed to aid, John, immediately he became sole ruler, sent an embassy to the pope. His delegates were authorised to make the emperor’s submission to the papal authority in exchange for the undertaking by the pope to furnish galleys against the Turks.