Charles Borromeo in the context of "St. Charles County, Missouri"

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. Born in Milan, his family considered itself a branch of the House of Medici and used the same coat of arms. Although modern historians have found no proof of this connection, the Medici of Florence recognised the claims of the Medici of Milan in the early 16th century.

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. His nephew, Cardinal Charles Borromeo, was a close adviser. As pope, Pius IV initiated a number of building projects in Rome, including one to improve the water supply.

The Archdiocese of Milan (Italian: Arcidiocesi di Milano; Latin: Archidioecesis Mediolanensis) 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.

The Archdiocese of Milan is the metropolitan see of the ecclesiastical province of Milan, which includes the suffragan dioceses of Bergamo, Brescia, Como, Crema, Cremona, Lodi, Mantova, Pavia, and Vigevano.

The Diocese of Lugano (Latin: Dioecesis Luganensis) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Switzerland covering the canton of Ticino. The diocese immediately subject to the Holy See. In 2004, there were 233,017 baptised persons of 306,846 inhabitants. It has as its principal patron Charles Borromeo, Archbishop of Milan, and as a secondary patron Abundius, Bishop of Como.

San Carlo ai Catinari, also called Santi Biagio e Carlo ai Catinari ("Saints Blaise and Charles at the Bowl-Makers"), is an early-Baroque style church in Rome, Italy. It is located on Piazza Benedetto Cairoli, 117 just off the corner of Via Arenula and Via dei Falegnami, a few blocks south of the church of Sant'Andrea della Valle.

The attribute ai Catinari refers to the presence, at the time of its construction, of the many makers of wooden basins (Italian catini) who worked in the area. The church was commissioned by the Order of the Barnabites and funded by the Milanese community in Rome to honour their fellow Milanese St. Charles Borromeo (Italian: San Carlo). It is one of at least three Roman churches dedicated to him (including San Carlo al Corso and San Carlo alle Quattro Fontane) and one of a number of great 17th century preaching churches built by Counter-Reformation orders in the Centro Storico (the others being The Gesù and Sant'Ignazio of the Jesuits, Sant'Andrea della Valle of the Theatines, and the Chiesa Nuova of the Oratorians).

The Karlskirche (English: Charles Church) is a Baroque church in the Karlsplatz in Vienna, Austria. The church is dedicated to Saint Charles Borromeo, a leading figure of the Counter-Reformation. The church is located on the border of Wieden and the Innere Stadt, the city centre.