Pope Pius IV (31 March 1499 – 9 December 1565), born Giovanni Angelo Medici, was Pope from 1559 to 1565. He is notable for presiding over the culmination of the Council of Trent. Giovanni Angelo Medici was born of humble parentage in Milan, unrelated to the Medicis of Florence. His early career connects itself in some measure with the rise of his elder brother, Gian Giacomo Medici, from the position of a mere bravo to that of Marchese di Ma...