Charles Borromeo was the Archbishop of Milan from 1564 to 1584 and a cardinal of the Catholic Church. He was a leading figure of the Counter-Reformation combat against the Protestant Reformation together with Ignatius of Loyola and Philip Neri. In that role he was responsible for significant reforms in the Catholic Church, including the founding of seminaries for the education of priests. He is honoured as a saint by the Catholic Church, with a feast day on 4 November.

The Archdiocese of Milan is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in Italy which covers the areas of Milan, Monza, Lecco and Varese. It has long maintained its own Latin liturgical rite usage, the Ambrosian rite, which is still used in the greater part of the diocesan territory. Among its past archbishops, the better known are Ambrose, Charles Borromeo, Pope Pius XI and Pope Paul VI.