Fountain in Piazza Santa Maria in Trastevere by a Roman aqueduct, the Aqua Traiana. When the aqueduct was ruined during the invasions of Rome, water came from underground sources below the Janiculum hill. The old fountain illustrated in the drawing of del Massaio had two vasques, one above the other, pouring water into the basin below. The fountain was reconstructed between 1499 and 1500 on the command of Giovanni Lopez, the bishop of Perouse and Bishop of the parish of Santa Maria in Trastevere, who gave the commission to Donato Bramante, the architect of St. Peter's Basilica. Bramante removed the upper vasque and added four carved stone
Fontana dei Quattro Fiumi been the Fountain of the Triton in Piazza Barberini, the Fountain of the Moor in the southern end of Piazza Navona erected during the Barberini papacy, and the Neptune and Triton for Villa Peretti Montalto, whose statuary now resides at Victoria and Albert Museum in London. Each has animals and plants that further carry forth identification, and each carries a certain number of allegories and metaphors with it. The Ganges carries a long oar, representing the river's navigability. The Nile's head is draped with a loose piece of cloth, meaning that no one at that time knew exactly where the