The Fountain of the Neptune in Rome, also known as the Fountain of the Boilermakers, is located at the northern extremity of Piazza Navona.
The work owns the design and the realisation of its tank to the same Giacomo della Porta author of the tank of the Moor Fountain
at the opposite extremity of the square.
It reached the unification of Italy without any decorations, and therefore to give to the Fountain of the Neptune a stylish similarity with the other fountains of the area, a competition was issued in 1878 for the realisation of the monumental apparatus; such competition was won by Gregorio Zappalą and Antonio Della Bitta.
The first one realised the decoration complex based on the mythological theme of the "Nereidi with cupids and walruses", the second one realised the group of marbles "Neptune fighting with an octopus" that takes again the theme of the physical fight that already the Fountain of the Moro had with the fight between the Ethiopian and the dolphin.