Portique romain du Forum

The Roman Portico of the Forum is what remains of the monumental colonnade that once framed the Roman forum of Vienne, in the Isère department of France. Two standing arches of the portico can be seen today in the Jardin archéologique de Cybèle, an archaeological garden laid out on the grounds of a former city hospital, a short walk from the Roman theatre.

What exactly is left to see?

The forum of Roman Vienne (ancient Vienna Allobrogum) followed the classic tripartite layout of provincial Roman fora: a central open plaza bordered on its long north and south sides by monumental porticoes. The plaza's western end held the sacred precinct, dominated by the Temple of Augustus and Livia, while a basilica used for administration and justice closed off the eastern side. Of that entire ensemble, two arches of the northern portico's colonnade are what survive above ground, and they now form the centerpiece of the Cybèle garden. Around them lie other excavated traces from the same district: the foundation walls of an assembly building and fragments of terraced houses that once stood nearby.

How do you get there and what should you expect?

The Cybèle archaeological garden sits in central Vienne, close enough to the Roman theatre that both sites are easily combined into one walking visit. The portico ruins are open as part of the garden and require no guide booking, but it helps to slow down and match the standing arches against a plan of the original forum — on their own, the two arches give only a partial sense of how large the complex once was.

Why does this site matter?

The portico is one of the better-preserved fragments of Roman public architecture surviving from this part of Gallia Narbonensis. It is listed in the French Mérimée heritage database under reference PA00117347 as "Restes du portique romain, dit du Forum," protected as an archaeological site since a 1993 record entry. That protected status is what has kept the two arches standing while the rest of the forum's footprint disappeared beneath the modern town.

When is the best time to visit?

Because the Cybèle garden is an open-air site, spring and autumn bring the most comfortable temperatures and the best light for photographing the stone arches. In summer, an early-morning visit is worth planning, before the open plaza heats up and fills with groups heading to the nearby theatre.

Frequently asked questions

Is this the same site as Vienne's Roman city walls? No. The Roman Portico of the Forum is a separate monument from the Enceinte romaine de Vienne (the Roman city ramparts) — they sit in different parts of the ancient city and are recorded as distinct heritage sites.

How much of the original forum survives? Only two arches of the northern portico's colonnade remain standing. The rest of the forum, including the Temple of Augustus and Livia and the basilica, stood in other parts of what is now central Vienne and is not visible at this same location.

Is entry to the Cybèle garden free? The archaeological garden is a public municipal space open to visitors; opening hours can vary by season, so it is worth checking locally before a visit.

How long should I plan for a visit? The portico itself takes only a few minutes to see, but combining it with the rest of the Cybèle garden and the nearby Roman theatre easily fills an hour or more.