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Understanding Roman architecture

Temple, amphitheatre, water distribution tank, ramparts: every Roman monument in Nîmes follows a precise plan. Here are a few keys to help you look at these buildings with an architect’s eye.

The Maison Carrée, a pseudo-peripteral temple

The Maison Carrée is a hexastyle Corinthian temple: six columns on the front. It is called pseudo-peripteral because its side and rear columns are engaged in the wall of the cella instead of standing free. In all, thirty columns 9 metres tall surround it. The temple stands on a podium 2.65 metres high, reached by fifteen steps. You first pass through the pronaos, a columned vestibule, before reaching the cella, 10.50 metres by 16, the sacred chamber, originally closed by a door almost seven metres high. The architrave is decorated with a frieze of scrolling foliage.

Geometric plan of the Maison Carrée, 1819: the front portico and the engaged columns around the cella.
Geometric plan of the Maison Carrée, 1819: the front portico and the engaged columns around the cella. Stanislas-Victor Grangent, Charles-Étienne Durand, Simon Durant (1819), Domaine public

The Arènes: moving around without mixing

The amphitheatre measures 133.38 metres by 101.40, and its arena 69 metres by 38. The 21 metre façade lines up two levels of 60 arches. Inside, the cavea has 34 rows of tiered seating divided into four zones, the maeniana, separated by corridors and low walls. Seats followed social rank: notables at the bottom, the common people at the top. Vaulted galleries and staircases led each group to its zone through the vomitoria, without crossing the others. At the top of the façade, pierced stone brackets held the masts of the velum, a canvas stretched to shield the audience from the sun. Drainage holes in the tiers carried away the rain.

Plan of the amphitheatre published in 1818: the ellipse of the arena, the tiers and the radiating passages.
Plan of the amphitheatre published in 1818: the ellipse of the arena, the tiers and the radiating passages. Alphonse de Seynes (1818), Domaine public

The aqueduct and the castellum

The aqueduct, about 50 kilometres long, ended at the castellum divisorium, on rue de la Lampèze. This circular basin almost 6 metres in diameter, originally covered, received the water and then distributed it through 10 openings of 40 centimetres, from which lead pipes ran to the different districts. At the bottom, three outlets fitted with bronze valves drained off the surplus. Discovered in 1844, it has been a listed historic monument since 1875.

The castellum of Nîmes: the circular basin and the outlets of the pipes.
The castellum of Nîmes: the circular basin and the outlets of the pipes. Tmv, CC BY-SA 4.0

The Augustan walls

Built under Augustus, in peacetime, the walls served mainly to display the city’s prestige. More than 6 kilometres long, they enclosed 220 hectares. The walls, almost 10 metres high and up to 3 metres thick, combined a base of medium and large dressed stones with a facing of pointed rubble stones over a core of infill. They had around 80 towers and about ten gates. The Porte d’Auguste, the Porte de France and the Tour Magne bear witness to them.

Maison Carrée
2.65 m podium, 15 steps
Arènes
34 rows of seating
Arena floor
69 x 38 m
Castellum
10 outlets of 40 cm
Walls
220 ha, around 80 towers

Sources