The removal of the pavement, for the insertion of a new heating system inside the church of San Sebastiano, occasioned a detailed archaeological investigation. The building stands near the site where a hoard of early Iron Age bronzes was found, about a century ago. Below the church, structures were revealed belonging to a Romanesque church with a semicircular apse, successively adapted to fit Gothic architectural canons. The church also overlays charcoal-rich deposits that are datable to the late Iron Age. Finds of burnt pottery and metal artefacts, the most notable of which is the large fragment of a finely decorated bronze torque, suggest that the church is built over a Rethic cult site. The investigations carried out north of the church showed the protostoric stratigraphy to be quite deep, but that it did not extend beyond the walls of the church. Despite its almost total robbing, it was possible to reconstruct the plan and pavement of the Romanesque church. The pavement, made up of a layer of mortar placed directly on the terrain, has been documented almost in its entirety. Also worthy of note are the 60 well preserved medieval coins that were found.