✝ Biography
Pope Pius IV (Italian: Pio IV; 31 March 1499 – 9 December 1565), born Giovanni Angelo Medici, was head of the Catholic Church and ruler of the Papal States from 25 December 1559 to his death, in December 1565. Pope Paul III appointed Medici Archbishop of Ragusa, and sent him on diplomatic missions to the Holy Roman Empire and Hungary. He presided over the final session of the Council of Trent.