The personal qualities of Carlo Borromeo were of grave importance in the election of a successor to his uncle. He had ruled the Church during the last years of Pius IV.; and the newly-appointed Cardinals were his dependents. Had he attempted to exert his power for his own election, he might have met with opposition. He chose to use it for what he considered the deepest Catholic interests. This unselfishness led to the selection of a man, Michele Ghislieri, whose antecedents rendered him formidable to the still corrupt members of the Roman hierarchy, but whose character was precisely of the stamp required for giving solidity to the new phase on which the Church had entered. As Pius IV. had been the exact opposite to Paul IV., so Pius V. was a complete contrast to Pius IV. He had passed the best years of his life as chief of the Inquisition. Devoted to theology and to religious exercises, he lacked the legal and mundane faculties of his predecessor. But these were no longer necessary. They had done their duty in bringing the Council to a favorable close, and in establishing the Catholic concordat. What was now required was a Pope who should, by personal example and rigid discipline, impress Rome with the principles of orthodoxy and reform. Carlo Borromeo, self-conscious, perhaps, of the political incapacity which others noticed in him, and fervently zealous for the Catholic Revival, devolved this duty on Michele Ghislieri, who completed the work of his two predecessors. Paul IV. had laid a basis for the modern Roman Church by strengthening the Inquisition and setting internal reforms on foot. Pius IV., externally, by his settlement of the Tridentine Council, and by the establishment of the Catholic concordat, built upon this basis an edifice which was not as yet massive. Carlo Borromeo and the Jesuits during the last pontificate prepared the way for a Pope who should cement and gird that building, so that it should be capable of resisting the inroads of time and should serve as a fortress of attack on heresy. That Pope was Michele Ghislieri, who assumed the title of Pius V. in 1566. Before entering on the matter of his reign, it will be necessary to review the state of Rome at this moment in the epoch of transition, when the mediaeval and Renaissance phases were fast merging into the phase of the Counter-Reformation. Old abuses which have once struck a deep root in any institution, die slowly. It is therefore desirable to survey the position in which the Papal Sovereign of the Holy City, as constituted by the Council of Trent, held sway there.