city, Lombardia ( Lombardy) regione, northern Italy. It lies along the Lambro River, just northeast of Milan. The ancient Modicia, it was a village until the 6th century AD, when the Lombard queen Theodelinda established a residence and a monastery there. During the period of the communes, Monza was sometimes independent, sometimes subject to Milan. The Visconti family built a castle there in 1325. The town withstood many sieges and was repeatedly plundered, notably by the troops of Charles V. King Umberto I of Italy was assassinated at Monza on July 29, 1900; an expiatory chapel was dedicated in 1910.

Monza is known for its cathedral, founded in 595 by Theodelinda and enlarged in the 13th century. The cathedral's green-and-white marble facade was erected in 1390–96 by Matteo da Campione, and the campanile dates from 1592 to 1606. Within the cathedral church is the iron crown (Corona Ferrea (Iron Crown of Lombardy)) of Lombardy, supposedly formed from one of the nails used at Christ's crucifixion and used after 1311 for the coronation of the Holy Roman emperors and of Napoleon at Milan in 1805. The church's rich treasury also contains the relics of Theodelinda and other crosses and reliquaries of the Lombard and Gothic periods. Also notable are the Church of Santa Maria in Strada (1357) with a terra-cotta facade of 1393; the 13th-century communal palace, Arengario; and the Villa Reale (royal palace; 1777–80), used for art exhibitions.

Monza is a busy industrial centre manufacturing felt hats and carpets, textiles, machinery, furniture, glass, paint, and plastics. It is the site of the famous Autodromo (automobile-racing track), which, because of its elliptical shape and concrete banked curves, is claimed to be the fastest in the world. Pop. (2006 est.) mun., 121,961.