Temple of Portunus

Stand still for a moment and listen. Traffic hums along the riverbank road. Somewhere behind you, a scooter climbs through its gears. In front of you, though, there is a small rectangular temple of pale, weathered stone. It looks almost too calm for its setting. The columns are grooved and slightly pitted. Where the sun hits them, they glow a warm grey. This quiet building has stood beside the Tiber for more than two thousand years, and it is one of the best-preserved temples from Republican Rome.

This is the Temple of Portunus. It sits in an area the ancient Romans called the Forum Boarium — the cattle market. Long before marble emperors and grand imperial forums, this flat ground by the river was a place of trade. Boats came up the Tiber and unloaded goods. Animals were bought and sold. Merchants shouted prices. It was noisy, practical, and a little smelly. It was the commercial heart of the early city, and this temple was built to serve it.

So who was Portunus? He was an old Roman god, and he is not a famous one today. He looked after keys, doors, and gateways. Over time, he also became the god of harbours and ports. The connection makes sense. A port is a kind of doorway — the place where a city opens to the outside world. Here, close to the river landing, sailors and traders could ask Portunus to protect their cargo and bring their ships home safely.

The Romans honoured Portunus with his own festival, called the Portunalia, held in August. Ancient writers mention that people threw keys into a fire as part of the rites. We do not know every detail of the ceremony. Still, the image stays with you. Imagine a crowd at the river's edge on a hot summer day, gathered around this temple, asking a god of doorways for luck in the year ahead.

Now look closely at the building itself. The temple stands on a tall platform, called a podium, so you must look up to the columns. At the front, four free-standing columns hold up a porch. Along the sides, the columns change. Most of them are not free at all. They are half-columns, attached to the solid wall of the inner room. From a distance, the temple looks as if columns surround it on every side. Up close, you can see the trick.

Architects call this design pseudoperipteral. It means 'false surround of columns'. The Romans borrowed the column-lined temple from the Greeks. Then they adapted it to their own taste. A Greek temple usually stood in the open, with steps on every side. A Roman temple like this one had a clear front and a single grand staircase. It was meant to be approached head-on, like the entrance to a house. That frontal design is a very Roman idea.

Take a look at the tops of the columns. They are Ionic capitals, with a pair of spiral scrolls, a little like rolled paper. The Ionic style came from the Greek world, especially the eastern Aegean. The temple was built in the late second or early first century before Christ, replacing an even older shrine on the same spot. In that period, Rome was growing rich and powerful. Greek art and architecture were becoming very fashionable among the Roman elite.

Here is something many visitors miss. The building was not always this colour. The walls and columns are made mostly of volcanic tufa, a soft local stone, with harder travertine used in key places for strength. In ancient times, much of this surface was covered with a thin coat of white stucco. The temple would have looked smooth and bright, almost like marble. What you see now is the rougher skeleton under that lost skin.

So how did such a modest temple survive, when so many grander ones vanished? The answer is faith — but a different faith. In the ninth century, the temple was converted into a Christian church. Later, it was dedicated to Saint Mary of Egypt, a desert saint from early Christian tradition. Because people kept using the building, they kept repairing it. Churches were protected. Abandoned pagan temples were often stripped for stone. A change of religion saved this place.

For centuries, the temple also had the wrong name. It was widely known as the Temple of Fortuna Virilis, a goddess of good fortune. Scholars later linked the site to Portunus instead, because of its position by the old river port. That is the name used today. Still, you may find the older name in historic drawings and guidebooks. During the Renaissance, architects came here to measure and sketch it. Andrea Palladio, the great Italian architect, included it in his famous book on architecture.

Now turn around and look at the neighbourhood. Just nearby stands a round temple, encircled by slender columns. It is usually called the Temple of Hercules Victor. Together, the two buildings make an unusual pair — one square, one round — both survivors of the Republic. Across the road is the church of Santa Maria in Cosmedin. Its porch holds the Mouth of Truth, a carved stone face. Legend has it that the mouth bites the hand of anyone who tells a lie.

Walk a little towards the river, and look for the Ponte Rotto, which means 'the broken bridge'. A single ancient arch stands alone in the water. Further along is Tiber Island, shaped a little like a ship. These views help you picture the old river port that Portunus once protected. The water was the city's highway. Ships, barges, and small boats arrived here from the coast. The temple faced this busy traffic every day.

The interior of the temple is rarely open to the public, so most people see it from outside. That is not a loss. The exterior is the real lesson. Walk slowly around the podium. Notice how the free columns at the front give way to the attached columns on the sides. Look for patches where newer stone fills old damage. Each repair is a small mark left by a different century and a different set of hands.

Before you leave, stand at the front again and look up at the porch. Think of the traders who climbed these steps, the priests who lit the fires, and the Christians who later prayed inside. Then listen once more to the traffic along the river road. The city around this temple has changed completely. The temple itself has barely moved. As you walk away, glance back over your shoulder. It is still there, quiet and patient, beside the water.