Charles spent much of his childhood at the Benedictine Abbey receiving his education. His uncle was Pope Pius IV, and he elected Charles as Secretary of State and made him Cardinal and Administrator of the see of Milan. He also served as Pius' legate on several diplomatic assignments, and was instrumental in having Pope Pius reconvene the Council of Trent. He became bishop of Milan, which in turn became a model see, due to the improvements he made and abuses he reversed. Throughout his life, he held his position and high ranking in humility, and constantly strove for sanctity. His feast day is celebrated on November 4th.