The Trevi Fountain of Rome, realized under the Pontificate of Clemente XII around 1735 after Christ along the "Palazzo Poli", is the work of the architect Nicolò Salvi and it is still nowadays alimented by the water supply system Virgin projected in 19 before Christ by the consul Agrippa.

Concerning the etymology of the monument, there are at least two hypothesis that both have their origins in the antique story of Rome: some people sustain that the name of the Fountain of Trevi comes from "Trivia", the girl who would have indicated to the General Marco Agrippa, coming back to Rome after the victorious battle of Anzio against Antonio, the source which then will serve as the spring, while others retain probable the alliteration of the Latin toponym "regio trivii", through which presumably was indicated either the intersection of three roads close to which surging the Roman fountain or the characteristic itself of the source to have three distinct jets of water.
The first work of arrangement and restoration of the water supply system is realized by Pope Nicolò V Parentucelli and Leon Battista Alberti and Bernardo Rossellino are charged of the projects; afterwards Urbano VIII Barberini charges Bernini to project a new source, who will start by destroying the pre-existing Renaissance elevation.
The works, however, stop to the realization of a basement at exedra, with a front tank in which join three mouths of water and only in 1730 after Christ, 90 years later, Pope Clemente XII will banish a competition for the definitive realization of the fountain of Trevi won by Nicola Salvi.
The attic of the Fountain of Trevi is decorated by four personified statues that represent, starting from left, "the Abundance of fruits", of Agostino Corsini, "the Fertility of the fields" of Bernardino Ludovisi, "the Gifts of Autumn" of Francesco Queirolo and "the Amenity of the grasslands" of Bartolomeo Pincellotti and at the top we find a large writing wanted by Pope Clemente XII, which stemma, at the top, is edged by two Fame of Paolo Benaglia.
In the biggest niche at the centre, edged by Corinthian columns, the big statue of the Ocean, projected by Giovan Battista Maini but sculptured by Pietro Bracci, leads a stagecoach having the form of a shell guided by a triton and dragged by two winged sea horses, one quick-tempered and the other placid while on the sides are located the personifications of the Healthiness and the Abundance by Filippo Della Valle.
Giuseppe Pannini, succeeding to Salvi to the direction of the works as the new architect of the Virgin Water, completed the project of Salvi with the creation of regular tanks with shiny sides in marble in the central part of the reef. The small piazza of Trevi, that welcomes the most famous fountain of Rome, is probably the most crowded place, full of visitors, which, as the tradition wants, throw a coin in the tank hoping that this gesture will guarantee them to come back to Rome again.