The overall structure: triumphal arch and palace
The most original feature of Nicola Salvi's design is the rejection of the fountain as an isolated object. Rather than designing a fountain at the centre of a square, Salvi built a system that incorporates the façade of the Palazzo Poli (a seventeenth-century building) as a permanent backdrop.
The central structural element is a great triumphal arch integrated into the palace façade. The arch is not merely decorative: it is the architectural frame that surrounds the main figure of Neptune and organises the entire composition.
Materials: the structure is in Roman travertine — the same limestone used for the Colosseum. Travertine has a warm, almost golden colouring that shifts through the day.
Dimensions: 49.15 metres wide, 26.3 metres tall. It is the tallest monument in the historic centre after the dome of St Peter's.
The central group: Neptune/Oceanus
The dominant figure at the centre of the fountain is conventionally called Neptune, but is more correctly identified as Oceanus — the primordial god of fresh and salt waters, distinct from the Roman Neptune (god of the sea).
The sculpture was completed by Pietro Bracci in 1762, a few months before the inauguration, following the death of Nicola Salvi. It is one of the largest Baroque sculptures in Rome.
The pose: Neptune stands on a shell-chariot, slightly off-balance — not frontal but in movement, typical of Baroque dynamism. He looks downward and outward toward the viewer.
The mantle: the drapery is studied to create effects of light and shadow that animate the figure.
The Tritons and seahorses
On either side of Neptune, two Tritons lead the procession:
- The right Triton (as you face the fountain): controls a calm seahorse, docile. Represents the tranquil sea.
- The left Triton: wrestles with a restive seahorse that rears up. Represents the stormy sea.
The calm/storm duality is a metaphor for the unpredictability of water and the sea. The two seahorses are technically called hippocamps — mythological creatures with a horse's body and a fish's tail.
The artificial rock
The element that most distinguishes the Trevi Fountain from other Roman Baroque fountains is the artificial cliff on which Neptune and the Tritons move.
It is not real rock: it is a construction of travertine and tufa skillfully modelled to imitate a natural formation. The technique was known as artificial sponge or rocaille — artificial simulation of grotto and rock.
This cliff serves multiple functions:
- It acts as a naturalistic pedestal that elevates the sculptural figures
- It conceals the hydraulic mechanism (pipes, connections)
- It creates a visual effect of depth and naturalism
Beneath the cliff, water emerges from openings and artificial cascades, giving the impression that the fountain springs from the earth.
The lateral niches: Abundance and Health
On either side of the central arch, two niches hold the main allegories:
- Left niche (from the viewer's perspective): Abundance, by Filippo della Valle (1762). A female figure with cornucopia and sheaf of wheat.
- Right niche: Health (Salubrity), also by Filippo della Valle (1762). A female figure with a serpent drinking from a cup.
The serpent in the Health figure recalls the medical caduceus and the symbol of healing. The two allegories represent the benefits of water: nourishment and health.
The reliefs above the niches
Above each of the two niches is a narrative relief:
Left relief: Agrippa approving the Acqua Virgo project. The scene shows the Roman general with his engineers and aqueduct plans.
Right relief: the virgin showing the spring to soldiers. This is the legendary scene that explains the name "Acqua Virgo" — a young woman supposedly showed Roman soldiers the source of the pure water in the countryside east of Rome.
The two reliefs are the water story of the fountain: a historical figure (Agrippa) and a legendary one (the virgin) who give meaning to the monument.
The attic: inscriptions and coats of arms
At the top of the façade:
- Coat of arms of Clement XII (original commissioner, 1730) on the left
- Coat of arms of Clement XIII (pope at inauguration, 1762) on the right
- Latin inscription at the centre commemorating the work and the popes who ordered it
The barber's vase: the legend
Nicola Salvi had a workspace overlooking the fountain. The story goes that a nearby barber constantly made critical remarks about the design. To shield himself from this "barber's criticism," Salvi reportedly placed a large travertine vase (still visible on the right side of the fountain, at the corner) specifically to block the barber's view.
The legend cannot be verified, but the vase is real. It is one of the curiosities that attentive visitors can find.
The basin and hydraulic system
The rectangular basin at the foot of the fountain is large: a capacity of approximately 40,000 litres. The water comes from the Acqua Virgo — approximately 80,000 cubic metres per day.
The system is circulatory: the water that overflows the basin is collected, filtered, and returned to the circuit. There is essentially no waste: the system is closed.
Visit the Trevi Fountain with a private driver
The fountain is in a ZTL zone — no private car access.
Visit the Trevi Fountain with a private driver: direct, comfortable arrival with no traffic or parking concerns. Service from €49. → Book your driver at myromedriver.com
Frequently asked questions
Who sculpted the central Neptune? Pietro Bracci, in 1762. The sculpture was completed shortly before the inauguration after Nicola Salvi's death.
What do the two Tritons symbolise? The calm sea (right Triton with docile horse) and the stormy sea (left Triton with rearing horse).
What do the two reliefs above the niches represent? Agrippa approving the Acqua Virgo project (left) and the virgin showing soldiers the spring (right).
Is the rock of the fountain real? No. It is an artificial construction of travertine and tufa, designed to simulate a natural formation.
What is the vase on the right side? According to legend, it was placed by Nicola Salvi to block the view of a critical barber. The vase is real; the legend is unverifiable.
Article no. 82 — TIER S — MON-05 Trevi Fountain Type: HISTORICAL Words: ~1,200