The temple is one of the best preserved of ancient Rome. Erroneously called the Temple of Manly Fortune, it is located next to the modern Rome City Council Registry Office, overlooking the Port Tiberinus at a sharp bend in the river. It was dedicated to Portunus, God of the river ports and protector of the Forum Boarium, where the cattle barges arrived for market. It dates back to the fourth or third century B.C., but what may be seen today is probably the result of restoration work carried out in the first century B.C. The main explanation of how it has so well managed to survive the ravages of time may be attributed to the fact that it was converted into the Christian Church of Santa Maria de Gradellis in 872 A.D., and Santa Maria Egiziaca in the fifteenth century. The temple stands on a raised travertine slab base and has four free-standing ionic columns on its front façade. Its sides bear five semi-encased columns, its rear two. The columns, bases and capitals are all of travertine marble, the encased columns in tufa extracted from the River Aniene, as are also the walls of the cella. A section of the architrave’s stucco surface has also survived bearing a relief of festoons of candelabra, while the cornice features lion protomes.
L'edificio è visibile anche dall'esterno.
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