"in pectore"; however, the nomination was never publicly revealed. In 1565, Pius IV offered the cardinalate to Jean Parisot de La Valetta, the grand master of the Order of Malta, in recognition for his defense of Malta against the Ottoman Empire; however, he declined the pope's invitation. Conspiracy A conspiracy against Pius IV, headed by Benedetto Accolti, cousin of cardinal Benedetto Accolti the Younger, was discovered and crushed in 1565. Architectural achievements During the reign of Pius IV, Michelangelo rebuilt the basilica of Santa Maria degli Angeli (in Diocletian's Baths) and the eponymous Villa Pia, now known as Casina Pio IV, in the Vatican Gardens designed by Pirro Ligorio. It is now the headquarters of the Pontifical Academy of Sciences. He also assigned Michelangelo to build Porta Pia. Pius IV also ordered public construction to improve the water supply of Rome. Beatifications During his papacy, Pius IV canonized no saints and only beatified one individual, Gundisalvus of Amarante, on 16 September 1561. Death Pius IV died on 9 December 1565 from complications following an infection in the urinary tract and a high fever. He was buried in Santa Maria degli Angeli on 4 January 1583 after his remains were initially housed at Saint Peter's Basilica. His successor was Pius V. Pius IV suffered from many illnesses such as gout which restricted his mobility. Giacomo Soranzo remarked between May and August 1565 to the Venetian Senate about the pope's health, commenting that he possessed a great natural vigor. However, gout impeded movement in his legs, shoulders, arms, and hands. Sorzano also mentioned that this meant that the pope, more often than not, needed to be carried in the sedia gestatoria to avoid walking. Pius IV also suffered from a major illness in 1564 from which he recovered. However, the pope fell ill eight days before his death with a constant fever throughout the duration. Carlo Borromeo, who arrived in Rome during the evening on 8 December, was with the pope when he died alongside Saint Philip Neri. See also Cardinals created by Pius IV House of Medici List of popes from the Medici family References Further reading Pastor, Ludwig, Freiherr von (1928). The History of the Popes from the close of the Middle Ages. Volume XV, Volume XVI (1928). London : Kegan Paul, Trench, Trübner & Co. Pattenden, Miles (2013). Pius IV and the Fall of The Carafa: Nepotism and Papal