According to tradition, the church was dedicated to St. Mark, patron of Venice, after the help given by that city in the war against Frederick Barbarossa in the 12th century. However, the first mention of the church dates from 1254 when the Augustinians built a Gothic style edifice with a nave and two aisles re-using pre-existing constructions.
The structure was heavily modified in the Baroque style during the 17th century, when it became the largest church in the city after the Duomo di Milano.
In early 1770, the young Mozart resided in the monastery of San Marco for three months and, on May 22, 1874, the first anniversary of the death of the Milanese poet and novelist Alessandro Manzoni was commemorated in the church by the first performance of Verdi's Requiem, written in his honour.
The façade dates from an 1871 restoration by Carlo Maciachini, who kept the marble portal with tympanum, a gallery of small arches, the rose window and three statues of saints attributed to Giovanni di Balduccio or the Master of Viboldone. In the lunette is a mosaic representing the Madonna between Saints, a copy of the original by Angelo Inganni.
The campanile dates from the 14th century. It was restored and completed in 1885. The interior, in the Baroque style, has a nave and two aisles.
In the first chapel on the right are frescoes by Gian Paolo Lomazzo. In the right transept is a fresco by the Fiammenghini with Alexander IV Instituting the Order of the Augustinians, under which a 14th-century Crucifixion was discovered in 1956. The author of the latter has been identified by Anovelo da Imbonate. The right arms of the transept houses also several sarcophagi from the mid-14th century, including the tomb of Lanfranco Settalo, counsellor of Archbishop Giovanni Visconti, by Giovanni di Balduccio.
Near the rear exit is a 16th-century tombstone portraying the Angel of the Resurrection, another fresco by the Fiammenghini (under which is a 14th-century fresco). On the side walls of the presbytery are the Dispute of St. Ambrose and St. Augustine by Camillo Procaccini and the Baptism of St. Augustine by Giovanni Battista Crespi.References:
The Château de Chaumont was founded in the 10th century by Odo I, Count of Blois. The purpose was to protect his lands from attacks from his feudal rivals, Fulk Nerra, Count of Anjou. On his behalf the Norman Gelduin received it, improved it and held it as his own. His great-niece Denise de Fougère, having married Sulpice d'Amboise, passed the château into the Amboise family for five centuries.
Pierre d'Amboise unsuccessfully rebelled against King Louis XI and his property was confiscated, and the castle was dismantled on royal order in 1465. It was later rebuilt by Charles I d'Amboise from 1465–1475 and then finished by his son, Charles II d'Amboise de Chaumont from 1498–1510, with help from his uncle, Cardinal Georges d'Amboise; some Renaissance features were to be seen in buildings that retained their overall medieval appearance. The château was acquired by Catherine de Medici in 1550. There she entertained numerous astrologers, among them Nostradamus. When her husband, Henry II, died in 1559 she forced his mistress, Diane de Poitiers, to exchange Château de Chaumont for Château de Chenonceau which Henry had given to de Poitiers. Diane de Poitiers only lived at Chaumont for a short while.
Later Chaumont has changed hands several times. Paul de Beauvilliers bought the château in 1699, modernized some of its interiors and decorated it with sufficient grandeur to house the duc d'Anjou on his way to become king of Spain in 1700. Monsieur Bertin demolished the north wing to open the house towards the river view in the modern fashion.
In 1750, Jacques-Donatien Le Ray purchased the castle as a country home where he established a glassmaking and pottery factory. He was considered the French "Father of the American Revolution" because he loved America. However, in 1789, the new French Revolutionary Government seized Le Ray's assets, including his beloved Château de Chaumont.
The castle has been classified as a Monument historique since 1840 by the French Ministry of Culture. The Château de Chaumont is currently a museum and every year hosts a Garden Festival from April to October where contemporary garden designers display their work in an English-style garden.