At the head end of the left hand aisle is the only proper side chapel that the church has. It was founded in 1593 by Catherine de' Nobili, married to Count Sforza di Santa Fiore. The chapel was restored in 1790-93 by Andrea De Dominicis and equipped with a splendid decoration of paintings, 14 different kinds of marble, alabaster, gilded bronze, stucco, etc.