The building is located close to the theater, in the central sector of the Roman city. It is a structure built of large blocks of local travertine squared. In the past, on the basis of Juvenal to the ruins had been given the name of “Temple of Diana”. In the writings of some nineteenth-century travelers, the building is mentioned by the name “S. Mary Magdalene “that would suggest his conversion, however, fairly common practice in late antiquity, in place of Christian worship.
Do not know the chronology of the monument, variously dated in the second century. B.C. in the Augustan age, or more generally in the second half of the sec.aC
Equally unknown is its function, attributable perhaps to a basilica.