It will then be an ally of Rome in 307 BC in the Samnites Wars in the Cause Italic, it will be destroyed by Hannibal because of his loyalty to the Romans in 216 BC. At the end of the war he was awarded the Romans with a complete reconstruction, while its inhabitants moved temporarily to nearby Avella. Attacked and even sacked during the Social War, she obtained Roman citizenship, inserted into the menenia Tribe. Probably in the time of Augustus (in 42 BC), the city became a Roman colony like all the neighboring cities, under the name of Nuceria Constantia.
The city has always kept its cultural origins, in fact, in that time, beyond the language of colonization that was imposed by Rome, by special status, she had kept the characteristic of talking and writing in Greek, and that as a sign of cultural distinction. The eruption of 79 AD, many damaged the city and surrounding countryside but it will quickly resume; does not diminish its importance. The city will soon recover and will increase in wealth, strength and prosperity, until the end of the Roman Empire, when it will start to decline. This process will end with the occupation of the area by the Lombards, who will ransack and leave uninhabited for many centuries. In 553, with the Battle of Lattaris Monts on the Sorrento side, ends the Ostrogothic domination.
Of the nineteenth century Excavated have uncovered some characteristic of the ancient city of Nuceria. The City occupied an area of 1200 x 950 m, and developped in typical Roman scheme, with straight streets which intersect at right angles.
The fortification walls of the city, the double curtain, were built in the second century BC and have a thickness of 1.5 m and a height of 5 m, while the distance between the two screens is to about 12 m; some feature of these walls have been found in recent excavations.
The Nuceria Greco-Roman Theatre was built in the second century BC It has been identified and highlighted in seventy years and eighties first in the area between the walls and Pucciano locality. Leaning against the south side of the ramparts of the ancient city of Nuceria Alfaterna, theater remainder of the first phase of construction of the second century BC, later it was incorporated as an extension actually era of Augustus Tiberius. The ensamble survived the eruption of Vesuvius in 79 AD, and continued to be used until the late fourth century. When, fell into disuse, was slowly stripped of its most valuable parts. Today it is partially excavated, and are visible parts of the auditorium, the orchestra and the stage parodoi section.
Recent excavations still ongoing, have helped to visualize that there was a central part of the town rich in monuments as a public amphitheater and a spa complex. Although the pattern of this monument is clear, remains difficult to visualize the complex and because much of its structure remains completely enclosed and incorporated in houses downtown. The currently visible structure appears to be dated from the mid-first century BC, with the end of the reconstructions of the first century AD. The remains of a large Thermal Complex are also visible, also inserted in the structure of the new city.
The 1994 excavations focused light on an important necropolis in Pizzone resort, it is located between the East City walls and the route of the Via Pompilia. It dates back to the first century BC. As usual in the Roman world, the tombs were placed along the main road out of town. Three major landmarks: the first built by the people (family) Numisia round, the second Mausoleum people with Cornelia Carée shape, and the third said the Lutatia people, overlooking the picturesque street by two staircases.