Main cathedral for the city, as well as the St. Leodegar and St. Maurice religious center. A Benedictine monastery was founded here in the 8th century.
In 1633, a fire destroyed the church; it was rebuilt in 1645. It is the most important Renaissance church in Switzerland. Especially noteworthy are the façade, Mary's alter (with a relief panel dating from 1500), and the souls' altar.