25 December 1559

Giovanni Angelo Medici is elected Pope Pius the IV.

Pope Pius IV, born Giovanni Angelo Medici, was an Italian priest of the Roman Catholic Church and the 225th Pope from 1559 to 1565. On the death of Pope Paul IV, he was elected pope on 25 December 1559, taking the name Pius IV.,[2] and installed on 6 January 1560. His first public acts of importance were to grant a general pardon to the participants in the riot after the death of his predecessor, and to bring to trial the nephews of his predecessor. One, Cardinal Carlo Carafa, was strangled, and Duke Giovanni Carafa of Paliano, with his nearest associates, was beheaded.

He is known for presiding over the final session of the Council of Trent.The most important feature of his pontificate will be his decision to reconvene the Council of Trent on January 18, 1562. It had been suspended ten years earlier, and getting started again is difficult because of political and religious disagreements between France and Spain.

Pope Pius IV, however, is skillful enough as a diplomat to achieve some compromises and get everyone working together. Once the Council of Trent reaches its final decisions in 1563, Pope Pius IV will work to ensure that its decrees are spread across the Catholic world.