This chapel was set up between 1611 and 1614 according to the will of Pierre Polet, a French priest. The dedication is to St. Cecilia, the patron saint of muscians. On the altar: The Ecstasy of St. Cecilia, a copy by Guido Reni of Raphael's painting. St. Cecilia is surrounded by St. Paul, St. John, St. Augustine and St. Mary Magdalene.