Its major portions were completed by a select group of the artist's pupils, including Antonio Raggi and Claude Poussin.  Its building was highly unpopular due to the new bread tax instituted to finance its construction.  The artist himself was responsible for the images at the center, which were carved in situ, and include a horse and a palm tree.  Another pupil, Baratta, was responsible for the b
Its major portions were completed by a select group of the artist's pupils, including Antonio Raggi and Claude Poussin.  Its building was highly unpopular due to the new bread tax instituted to finance its construction.  The artist himself was responsible for the images at the center, which were carved in situ, and include a horse and a palm tree.  Another pupil, Baratta, was responsible for the bearded black man who sits on a pile of coins and has his arm upraised, a gesture theorized to be an insult to the design of the neighboring church of Sant'Agnese by Borromini.  It is also populated by several types of animals, including a few lions and the dove at the top representing the Pamphili family of its patron, Innocent X.  For 10 points, name this structure in the Piazza Navona of Rome that was designed by Bernini and includes personifications of the Rio de la Plata and the Ganges.
Its major portions were completed by a select group of the artist's pupils, including Antonio Raggi and Claude Poussin.  
Fountain of the Four Rivers (or Fontana dei Quattro Fiumi)