The Cathedral was commenced in 1488 and was not completed until the end of the 800s following the original project. It is located on a site where two Roman cathedrals once stood (Saint Stefano – attended in summer and Saint Mary of the People – attended in winter). The designers included Rocchi, Amadeo and Fugazza, along with Bramante and Leonardo, although it is imagined that they merely contributed ideas and advice. The church is built following a Greek cross plan and the octagonal dome is the third largest in Italy (after Saint Peter’s in the Vatican and the Basilica di Santa Maria del Fiore in Florence) and contains the remains of Saint Siro, the city’s patron saint and its first ever bishop. Recent excavations in the Saint Mary of the People crypts have revealed some important findings and magnificent mosaics dating back to the 11th century. The Civic Tower stood next to the Cathedral until its collapse in 1989.