PAUL IV. (Giovanni Pietro Caraffa), pOpe from 1555 to 1559, was born on June 28, 1476, of a noble Neapolitan family. His ecclesiastical preferment he owed to the influence of an uncle, Cardinal Oliviero Caraffa. Having filled the post of nuncio in Eng land and Spain, he served successive popes as adviser in matters pertaining to heresy and reform. But he resigned his benefices, and, in conjunction with Cajetan, founded the order of the Thea tines (1524) with the object of promoting personal piety and of combating heresy by preaching. In 1536 Paul III. made him cardinal-archbishop of Naples and a member of the reform com mission. After the failure of Contarini's attempt at reconciliation with the Protestants (1541) the papacy committed itself to the reaction advocated by Caraffa ; the Inquisition and censorship were set up and the extermination of heresy in Italy undertaken with vigour.
Elected pope, on May 23, 1555, in the face of the veto of the emperor, Paul regarded his elevation as the work of God. With his defects of temper, his violent antipathies, his extravagant motion of papal prerogative, his pontificate was filled with strife. He joined with France in order to drive the "accursed Spaniards" from Italy. But the victory of Philip II. at St. Quen tin (1557) and the threatening advance of Alva upon Rome forced him to come to terms and to abandon his French alliance. He de nounced the peace of Augsburg as a pact with heresy; nor would he recognize the abdication of Charles V. and the election of
Ferdinand. By insisting upon the restitution of the confiscated church-lands, assuming to regard England as a papal fief, and re quiring Elizabeth, whose legitimacy he aspersed, to submit her claims to him, he raised insuperable obstacles to the return of England to the Church of Rome.
Paul's attitude towards nepotism was at variance with his character as a reformer. An unworthy nephew, Carlo Caraffa, was made cardinal, and other relatives were invested with the duchies of Paliano and Montebello. It was Paul's hope in this way to acquire a support in his war with the Spaniards. But the defeat of his plans disillusioned him, and he turned to reform. A stricter life was introduced into the papal court ; the regular observance of the services of the Church was enjoined ; many of the grosser abuses were prohibited. These measures only increased Paul's un popularity, so that when he died on Aug. 18, 1559, the Romans vented their hatred by demolishing his statue, liberating the prisoners of the Inquisition, and scattering its papers. Paul's want of political wisdom, and his ignorance of human nature aroused antagonisms fatal to the success of his cause.
See references under Paul III.; also Castaldo, Vita del pontifice Paolo Quarto (Modena, 1618) ; Ranke, Popes (Eng. trans. by Austin), i. 286 seq. (an excellent sketch) ; Ancel, Disgrace et proses des Caraffa (1909) ; Riess, Politik Pauls IV. (1909).