Not much more is known historically of Sulmo, which, however, appears to have continued to be a considerable provincial town. Ovid speaks of it as one of the three municipal towns whose districts composed the territory of the Paeligni: and this is confirmed both by Pliny and the "Liber Coloniarum"; yet it does not seem to have ever been large, and Ovid himself designates it as a small provincial town. From the "Liber Coloniarum" we learn also that it had received the status of a colony, probably in the time of Augustus; though Pliny does not give it the title of a Colonia. Inscriptions, as well as the geographers and Itineraries, attest its continued existence as a municipal town throughout the Roman Empire.