Ancient Suasa

The ancient town of Suasa lies in the middle reaches of the River Cesano, occupying an alluvial terrace now known as Pian Volpello. The settlement’s origins lie in the aftermath of the Battle of Sentinum in 295 BC, an event that paved the way for the establishment of the colony of Senigallia and the subsequent land redistribution carried out under the Lex Flaminia de Agro Gallico et Piceno viritim dividundo in 232 BC. Against this backdrop of intense colonisation, Suasa initially took shape as a centre of civic and commercial activity, likely a forum or a conciliabulum, rapidly evolving into a key hub for the administration of justice and the social life of the region.

The urban layout of Suasa was profoundly influenced by the road network that existed prior to the construction of the Via Flaminia. The town served as the hub of a route network connecting the Adriatic coast with the Sassoferrato basin, linking up with major thoroughfares such as the Salaria Gallica. This reliance on valley-floor routes and the proximity to the River Cesano meant the town faced a constant challenge from the river’s dynamics. Geomorphological studies and photogrammetric analyses have in fact shown that the ancient riverbed flowed at a higher elevation than the current one, forcing Roman builders to undertake massive artificial embankment works, as in the case of the Commercial Forum area, and to construct complex drainage systems to mitigate the risk of flooding.

The official recognition of the status of municipium occurred at an early date, certainly before the 40s BC. This status of administrative autonomy is confirmed both by literary sources – notably the list of towns in Regio VI compiled by Pliny the Elder – and by significant epigraphic evidence uncovered during archaeological investigations. These inscriptions attest to the presence of local magistracies, such as the duoviri, confirming the full political maturity of the Suasa community as early as the Augustan age.

A significant episode in its Republican history is linked to the creation of an enclave of Antony’s veterans from Pesaro, an event that involved the seizure of part of the municipal territory, documented today by the famous boundary stones bearing the inscription ‘fines Suasanorum’.

The decline of Suasa was due to a combination of human and environmental factors. Although the town was finally abandoned during the Greco-Gothic War (535–553 AD), when the population sought refuge on the surrounding hills to escape the insecurity of the valley floor, the town’s decline was accelerated by progressive hydrogeological instability.

 Indeed, from the 4th century AD onwards, worsening climatic conditions and reduced maintenance of the land led to instability in the River Cesano. The morphological bottleneck at San Michele, situated just downstream of the Roman town, encouraged backflow phenomena that led to frequent flooding. These events not only damaged the lower parts of the Suaso settlement but also obliterated much of the Roman centuriation, rendering the river terrace increasingly uninhabitable.

 After its final abandonment, the site became fully integrated into the rural landscape of the valley. The ruins became a source of building materials for neighbouring medieval settlements, but it was precisely the absence of new construction layers that allowed the Roman layout to ‘crystallise’ beneath the agricultural soil, making Suasa today an exceptional archaeological site for the study of urban development in the Adriatic region.