The large tombstone in the floor of Cardinal Mario Mellini (d. 1756) is inlaid with colorful stones in typical Baroque fashion. The inscription says that Mellini was minister plenipotentiary of Maria Theresa, Empress and Queen of Hungary at the Holy See "in the most difficult times", and his tomb was erected by his nieces, Anna Serlupi and Giulia Falconieri and his nephew, Antonio Casali in 1760. The epitaph is set in a Baroque crest which is flanked by green branches and surmounted by the coat-of-arms of the cardinal. The allegorical figures of Prudence (left with mirror in her hand) and Fortitude (right with sword) are reclining on the top of the crest.