Saint Charles Borromeo (1538-1584) was an Italian cardinal and Archbishop of Milan who spearheaded major Counter-Reformation reforms, implementing Council of Trent decrees through spiritual renewal, establishing seminaries, fighting clerical corruption, and showing heroic charity during a devastating plague, living a life of radical simplicity despite his noble background, and becoming a model for Catholic reformers. He is a patron saint for catechists, seminarians, and spiritual leaders, remembered as an icon of pastoral care and dedication.