The Roman Theatre was brought to light in the thirties of the last century, eliminating the medieval houses that had been built using its walls. Restored and partially rebuilt, it shows the cavea (steps for the spectators) leaning against the slope of the hill of S. Giusto, the orchestra at its feet and part of the scaena, that is the stage with backstage decorated with niches in which were statues of members of the imperial family or notable figures of the urban community. Among them was Quintus Petronius Modestus, procurator and Flame of Trajan, who at the beginning of the 2nd century contributed to the restoration of the theatre, as can be read from the cast of two twin inscriptions preserved in the archaeological area. The first phase of the theatre dates back to the Augustan age.
