Natale Rondinini served as secretary of Pope Alexander VII until his early death at the age of thirty in 1657. His funeral monument was designed by Domenico Guidi. It is attached to the second pillar of the nave on the left. The richly decorated Baroque monument is made up of the plaque of the inscription, the bust of the deceased in a round niche and the coat-of-arms of Rondinini at the top. The plaque is framed by leafy garlands and crowned by a shell which is set between two acanthus scrolls. The symbol of Death, the skull and crossbones rears under the plaque folding up the crest. The edge of the central niche is decorated with a string of bay leaves and the niche itself is flanked by two flaming urns tied with wide ribbons. The coats-of-arms are crowned with a bishop's hat and a conch.