The name of Trevi is supposed by some writers to be derived from these three streams of water--three ways, Trevie; but there is more reason to believe that the fountain took its name from the mediæval name of that quarter of the city--Regione Trevi, from trevium, because of three roads which converge near the present Piazza of Trevi. Sixtus IV had constructed near the fountain a large public washing-trough, and the whole composition was extremely simple and practical. The Rome of Sixtus V and Paul V became too sumptuous for the old fountain, and as early as 1625 plans were made for its reconstruction. The Barberini Pope, Urban VIII, had his own ideas of magnificence; he proposed to change the fountain from its old site to its present position against the southern façade of the great Poli Palace; and Bernini made for him some beautiful sketches for the new masterpiece. Urban VIII stripped the portico of the Pantheon of its bronze and also carried off a part of the base of the tomb of Cecilia Metella, proposing to construct his fountain out of these materials. The Roman people, whose love for their own antiquities was constantly growing, showed such indignation when the Pope’s project became known that Urban was actually obliged to abandon his scheme, and it was not until eleven pontificates after his time that the work on the new fountain was really begun. Then it was intrusted to the architect Niccolo Salvi by Clement XII (Corsini, 1730–1740), and after the death of this pontiff and his successor, Benedict XIV, and eleven years after the death of Salvi himself, the fountain was at last finished. This was in 1762, under Clement XIII (Rezzonico, 1758–1769). Niccolo Salvi had succumbed prematurely to the hardships of his task. The construction of the fountain necessitated spending much time in the subterranean chambers of the Virgo Aqueduct, and this had proved fatal to Salvi’s health. The tomb of Cecilia Metella was never again attacked, and there is no bronze in the present fountain; in other respects the great scheme of Urban VIII was revived. The fountain was placed against the Poli Palace, and Salvi used for the sculptural part of the fountain Bernini’s beautiful designs.