Queen Theodelinda is believed to have commissioned the first chapel in 595, on a Greek cross plan, and only its walls survive. The article says the basilica was largely finished by 603. A 13th-century church was built on its remains, and from 1300 it was rebuilt as a Latin cross basilica with an octagonal tiburium.
Matteo da Campione is credited with the choir and the Pisan-Gothic west front, begun in the late 14th century in white and green marble. The article calls the facade Romanesque in structure and Gothic in decoration, and the interior mainly Baroque. The bell tower was erected in 1606.
The Iron Crown is kept in the treasury, entered from the right transept. It is not a cathedral by rank, since Monza belongs to the Diocese of Milan. An archpriest has charge of it.

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