The oldest round church in the city. There are no documents to testify to this but from its peculiar architecture it is assumed that it was founded between the end of the 11th century and the beginning of the 12th at the wish of Countess Matilda of Canossa. Externally it presents a very simple architecture but upon entering you will be invested by a feeling of awe. In 1579, the church was closed for worship at the behest of Guglielmo Gonzaga and for over three hundred years it was incorporated into the surrounding houses and shops. It was only at the beginning of the 19th century that the demolition of the buildings next to the Clock Tower brought it back to light. It was freed from the irrelevant architectural parts and the long recovery and restoration work began. Today it is managed and protected by the Association for Dominican Monuments and has obviously been reopened for worship. Admission is free, or rather, by donation.