Temple of Portunus

Architecture

It is in the Ionic order and is by the ancient Forum Boarium by the Tiber. During Antiquity the site overlooked the Tiberine port at a sharp bend in the river; from here, Portunus watched over cattle barges as they entered the city from Ostia.

The temple was originally built in the 3rd or 4th century BC and was rebuilt between 120 and 80 BC. The rectangular building consists of a tetrastyle portico and cella, raised on a high podium reached by a flight of steps, which it retains. Like the Maison Carrée in Nîmes, it has a pronaos portico of four Ionic columns across and two columns deep. The columns of the portico are free-standing, while the remaining five columns on the long sides and the four columns at the rear are half-columns engaged along the walls of the cella. This form is sometimes called pseudoperipteral, as distinct from a true peripteral temple like the Parthenon entirely surrounded by free-standing columns. The Ionic capitals are of the original form, different in the frontal and side views, except in the volutes at the corners, which project at 45°, a common Roman detail. It is built of tuff and travertine with a stucco surface.

If still in use by the 4th-century, the temple would have been closed during the persecution of pagans in the late Roman Empire. The temple owes its state of preservation to its being converted for use as a church in 872 and rededicated to Santa Maria Egiziaca (Saint Mary of Egypt). Its Ionic order has been much admired, drawn and engraved and copied since the 16th century. The original coating of stucco over its tufa and travertine construction has been lost.

The circular Temple of Hercules Victor is south-east of the temple in the Forum Boarium; it was also turned into a church, as Santa Maria del Sole, for many centuries.

The 18th century Temple of Harmony in Somerset, England is a folly based on the Temple of Portunus.