The monument on the left wall is for Cardinal Giovanni Garzia Mellini (d. 1629), the vicar general of Rome, by Alessandro Algardi, in 1637-38, and is a masterpiece. The monument was erected by the cardinal's nephews, Mario and Urbano Mellini. The centrepiece of the monument is the white Carrara marble bust of the Cardinal in a niche which shows him leaning forward and turning towards the altar, his left hand on his heart and his right hand holding a prayer book. The monument itself is a classicising aedicule framed by flat pilasters with masks and crowned by a broken segmental pediment with the Mellini coat-of-arms in a conch. The voluminous epitaph follows the stages of Giovanni Garzia's prestigious career from his youth until his death, including his important diplomatic missions for Pope Paul V to Philip III of Spain and the warring Habsburg brothers of Emperor Rudolf II and Matthias.