It is dedicated to the Patron Saint and healer of the plague-strick-en. Inside you can see the invaluable frescos painted by some pupils of Carracci from 1618. The saint's life is represented in 11 frescoes on the walls. The coffered ceiling, giving illusion effects, was made be well-known artists, such as Canuti and Cavedoni. The ones representing the Virtues, the city's patrons, the doctors of the Church and the Evangelists are really remarkable.