Cajetan, Or Cajetanus(Ital. Gaetano). I. Benedetto. See Boniface VIII. II. Tommaso de Yio, an Italian cardinal, born at Gaeta, Feb. 20, 14G9, died in Rome, Aug. 9, 1534. He entered the order of Dominican friars, studied philosophy and theology at Naples and Bologna, and in 1508 was elected general of his order. When Pope Julius II. was summoned to appear before the council of cardinals at Pisa and afterward at Milan, Cajetan undertook his defence, maintaining that the power of convening a council belonged solely to the pope. In 1517 he was sent by Leo X. as papal legate to Germany, to induce the emperor Maximilian to join the league against the Turks, and especially to bring the Lutherans back to their allegiance to the papal see. His haughty manner defeated the purpose of his mission. In 1519 he attended the assembly of the German electors at which Charles V. was chosen emperor, and contributed much to this choice. In the same year he was appointed to the see of Gaeta, and afterward filled several important missions, among which, in 1523, was that of legate to Hungary, then invaded by the Turks. At the capture of Rome by the imperialists in 1527, he was made prisoner, and had to pay a ransom of 5,000 crowns.

He wrote several works, all of which, though somewhat modified, were published at Lyons in 1639. Among these are a translation, with commentary, of the Old Testament in 5 vols. fol.; commentaries on Thomas Aquinas; and Opuscula, containing his treatise on the authority of the pope, of which a refutation was published by order of the faculty of the university of Paris. III. Enrico, properly Sermaneto, an Italian cardinal, died in Rome in 1599. He was made cardinal in 1585, and in 1589 was sent by Pope Sixtus V. as legate to France, to bring about the election of a Catholic king; he took part with the league, and was active in the intrigues of the time. He was recalled by the pope, but was afterward employed in important affairs. He was the author of several political and theological works.