I. The Vatican was the most natural refuge of a Latin emperor, who had been driven from his throne; and Pope Urban the Fourth appeared to pity the misfortunes, and vindicate the cause, of the fugitive Baldwin. A crusade, with plenary indulgence, was preached by his command against the schismatic Greeks: he excommunicated their allies and adherents; solicited Louis the Ninth in favor of his kinsman; and demanded a tenth of the ecclesiastical revenues of France and England for the service of the holy war. 29 The subtle Greek, who watched the rising tempest of the West, attempted to suspend or soothe the hostility of the pope, by suppliant embassies and respectful letters; but he insinuated that the establishment of peace must prepare the reconciliation and obedience of the Eastern church. The Roman court could not be deceived by so gross an artifice; and Michael was admonished, that the repentance of the son should precede the forgiveness of the father; and that _faith_ (an ambiguous word) was the only basis of friendship and alliance. After a long and affected delay, the approach of danger, and the importunity of Gregory the Tenth, compelled him to enter on a more serious negotiation: he alleged the example of the great Vataces; and the Greek clergy, who understood the intentions of their prince, were not alarmed by the first steps of reconciliation and respect. But when he pressed the conclusion of the treaty, they strenuously declared, that the Latins, though not in name, were heretics in fact, and that they despised those strangers as the vilest and most despicable portion of the human race. 30 It was the task of the emperor to persuade, to corrupt, to intimidate the most popular ecclesiastics, to gain the vote of each individual, and alternately to urge the arguments of Christian charity and the public welfare. The texts of the fathers and the arms of the Franks were balanced in the theological and political scale; and without approving the addition to the Nicene creed, the most moderate were taught to confess, that the two hostile propositions of proceeding from the Father by the Son, and of proceeding from the Father and the Son, might be reduced to a safe and Catholic sense. 31 The supremacy of the pope was a doctrine more easy to conceive, but more painful to acknowledge: yet Michael represented to his monks and prelates, that they might submit to name the Roman bishop as the first of the patriarchs; and that their distance and discretion would guard the liberties of the Eastern church from the mischievous consequences of the right of appeal. He protested that he would sacrifice his life and empire rather than yield the smallest