The treasure of the church is the Baroque Chapel of St Andrew at the far end of the right hand aisle, the one which belonged to the Confraternity of Fishmongers (Università dei Pescivendoli). In 1579 the chapter of S. Angelo in Pescheria gave the University of Pescivendoli the chapel to dedicate it to the cult of Sant'Andrea, granting permission to restore it and decorate it. The works were carried out between 1579 and 1619.