Pope he had spoken of the revenge which he would one day exact against his uncle; and one of the best informed statesmen of the age, whose memoirs have descended to us, declares that every person who understood anything of the condition of Europe, believed assuredly that he would at last execute his threat.[4] [Sidenote: The Emperor returns from his successes in Africa,] But as yet no favourable opportunity had offered itself. His arms were occupied with other enemies; the Irish rebellion had collapsed; the disaffection in England seemed unable to coalesce with sufficient firmness to encourage an invasion in its support. It was not till the close of the year 1535, when Charles returned to Naples covered with glory from his first expedition into Africa, that means and leisure for his larger object at length offered themselves. His power and his fame were now at their zenith. He had destroyed the Moslem fleet; he had wrested Tunis from the dreaded Barbarossa; he had earned the gratitude of the Catholic world by the delivery of twenty thousand Christian slaves. The last ornament might now be added to his wreath of glory, if he would hush down the tumults of heresy as he had restored peace to the waters of the Mediterranean. [Sidenote: And meditates a crusade against heresy.] With this intention Charles remained in Italy for the winter. The Pope again meditated the publication of the Bull of Deposition;[5] a circular was issued from the Vatican, copies of which were sent even to the Lutheran princes, inviting a crusade against England,[6] and Cardinal Granvelle was instructed to sound the disposition of Francis, and persuade his coöperation. The Emperor would be moderate in his demands; an active participation would not be required of him;[7] it would be sufficient if he would forget his engagement with an excommunicated sovereign to whom promises were no longer binding, and would remain passive. [Sidenote: Dubious disposition of Francis.] [Sidenote: Persecution of Protestants in Paris.]