A first-century theater or municipal assembly hall

The Jardin archéologique de Cybèle in Vienne, Isère, contains archaeological remains from a neighborhood of a former city. The site is divided into three identifiable groups: the arcades of a portico bordering the forum area, a large stone wall with a quadrangular plan likely used for municipal assembly meetings, and a residential quarter with identifiable houses and terraces.

A building measuring 48 by 38 metres stands on the site, featuring a north wall of limestone in large blocks with a regular setback and an external cornice. Between the north and south walls are stone tiers arranged in a 1/5 circle. This structure has been interpreted as either a theater for the mysteries of Cybele and Attis or as an auditorium for the city's assembly. The construction dates back to the beginning of the first century.

In later history, the north wall of this building served as a rampart for the construction of the maison-forte des Canaux and became part of a medieval enclosure. Before the area was developed into a park, much of the site was occupied by the Hôpital de Vienne, which was destroyed during the establishment of the current hôpital du Mont-Salomon.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons