On the south side, the Fountana del Moro fed by the Acqua Virgo aqueduct, is the most eye-catching of the two, and once again Gian Lorenzo Bernini is involved in its realisation.
The project of Della Porta was realised using Carrara marble and pink marbles for the mixtilinear basin, and it was decorated with four tritons, originally intended to be placed in the fountain in Piazza del Popolo, but never used.
In 1655, Pope Innocenzo X Pamphilj decided to add a central sculptural element that was commissioned to Bernini and realised after his design by its disciple Giovanni Antonio Mari.
The central character (perhaps Neptune) resembles a Moor/African/Ethiopian according to the source; that’s why the name “Fonatan del Moro”. This human-fish being, standing on a shell, is strangling a dolphin spouting the water from its mouth.