In 1730 Pope Clement XII organized a contest in which Nicola Salvi initially lost to Alessandro Galilei — but due to the outcry in Rome over the fact that a Florentine won, Salvi was awarded the commission anyway.[8] Work began in 1732, and the fountain was completed in 1762, long after Clement's death, when Pietro Bracci's Oceanus (god of all water) was set in the central niche.
The asso di coppe

Salvi died in 1751, with his work half-finished, but before he went he made sure a stubborn barber's unsightly sign would not spoil the ensemble, hiding it behind a sculpted vase, called by Romans the asso di coppe, "the "Ace of Cups".

The Trevi Fountain was finished in 1762 by Giuseppe Pannini, who substituted the present allegories for planned sculptures of Agrippa and "Trivia", the Roman virgin.