Four medieval buildings (13th-14th century) were found in the “Duomo” station at piazza Nicola Amore (also known as dei Quattro Palazzi), which was opened during the “Reclamation”. These structures show a change in use of the area, with the obliteration of the defensive walls which, from the Greek period (5th-4th century B.C.) until the ducal period (11th century A.D.), had characterised the topography of this zone, situated along the northern side of the present piazza, at the crossroads with via Duomo. Of the Greek walls two tufa tie courses were preserved, belonging to the 5th-4th century B.C. phase which, facing the sea, starting from the projecting hill of San Marcellino, formed an ample indentation as far as piazza Nicola Amore. The wall then continued below Corso Umberto I towards via P. Colletta and piazza Calenda. The internal curtain wall was preserved, reused in a medieval sewer, whilst the external curtain was robbed in the same period. However, the negative traces of the removed tufa blocks remained impressed on the cement core of an imposing scarp of quadrangular tufa ashlar, preserved to a height of over 5 m. Reinforced with opus caementicium cross walls, it was probably built during the work to restore and enlarge the town walls undertaken by Valentinian III in the 5th century A.D. or was part of the restorations undertaken by Narsete in the 6th century A.D. during the Graeco-Gothic war.

Finds of statues and inscriptions in the area of Corso Umberto and piazza N. Amore during levelling undertaken by the Reclamation Society had suggested the existence of prestigious public monuments. The agonistic nature of many inscriptions linked to Olympic-type games instituted by the Emperor Augustus at Neapolis in 2 A.D., suggested that the coastal strip in front of the ancient town was the site of the gymnasium, stadium and the hippodrome. The excavation for the Duomo station confirmed the presence of an important temple building immediately outside the Greek walls, which ran from the beginning of via Duomo on piazza N. Amore. The urban expansion outside the Greek walls seemed to have taken place at the beginning of the 1st century A.D. and occupied an emerged beach which had formed before the 3rd century B.C. Of the temple the brick built podium, surrounded by an external ambulatory paved with a mosaic of large marble tesserae, belonging to a restoration datable to between the 3rd-4th century A.D. was preserved. A large staircase with marble balustrades was built along the short western side of the podium the result of a more serious restoration. The imposing marble architectural decoration and a number of sculptures suggested that the temple was of Julio-Claudian date. Incorporated within the interior of the cult building was an earlier structure of which the mosaic pavement with hexagons of small black and white tesserae was preserved, datable to the beginning of the 1st century A.D. The building was probably abandoned at the end of the 4th-beginning of the 5th century A.D. The collapse of the decoration occurred around the mid 6th century A.D. Shortly afterwards the ancient edge of the Greek walls was restored, whose remains were incorporated into an imposing curtain of quadrangular tufa blocks. Found at the beginning of via Duomo, it can be ascribed to the restoration of the fortifications by Narsete. The area was thus destined for use as a necropolis which developed between the end of the 6th and the 10th century A.D.

Geo-archaeological core samples revealed a submerged environment, in a narrow inlet which penetrated as far as the base of the scarp on which the Greek town walls were subsequently built. The excavation brought to light beach levels, with materials datable from the Late Bronze Age onwards. A facing slab with a double plait dated to about the middle of the 6th century B.C. and constituted a clue to the presence of a sacred building which predated the foundation of Neapolis. The coastal strip outside the walls was occupied in the second half of the 5th century B.C. In fact, south of the station shaft a cemetery area was discovered which to date has revealed infant burials, cremation burials and burials inside jars. A building to the north of the necropolis dated to the same period. Three parallel curtain walls in tufa blocks alternating with cross walls in tufa chippings were preserved. At the end of the 4th century B.C. a new building was constructed, on the same alignment as the walls behind and delimited to the north by a beaten tufa road surface. This was a rectangular hall with a banqueting room. Of the latter a floor and the side benches for the klinai, made of opus signinum decorated with limestone tesserae, were preserved. The presence of votive objects may suggest a sanctuary function for the complex which seemed to remain in use until the mid 3rd century B.C. It was definitively abandoned at the beginning of the 2nd century B.C., when the wells providing its water were obliterated by dumps from pottery workshops. Around the middle of the 2nd century B.C. the beach in front of the walls was monumentalised. To date this is attested only by the structures of a portico of tufa blocks bearing numerous quarry marks situated south of the station shaft.

In piazza N. Amore exploration continued of the temple and related portico which were part of the sanctuary of the Olympic-type games. In the southern part of the excavation a road came to light, laid in the 3rd century B.C. and continuing in use until the Augustan period. To the north it followed the line of the back wall of the portico and to the south the line of a structure of stone blocks datable to the beginning of the 3rd century B.C. The road was made up of levels of beaten earth and yellow tufa, between which a limestone paving could be distinguished, datable to the mid 2nd century B.C. In the Augustan period a garden was built over the road. The road was built as part of an urban layout centred on the construction of the colonnaded portico at the beginning of the 2nd century B.C. Excavation of the latter and of the adjacent spaces provided data regarding the building phases of the structure. In fact, on the interior the walls presented a succession of visible facings dating from the 2nd century B.C. to the end of the 1st or beginning of the 2nd century A.D. However, on the exterior the entire wall construction was built up against the earth in _opus caementicium_ in the Flavian-Trajanic phase and in _opus incertum_ in the Augustan phase. To the north and south of the portico’s back wall the continuation of the 5th-4th century B.C. architectural complex emerged where a large rectangular hall came to light. Lastly, the intervention in the temple area aimed to define the construction phases through the excavation of a number of trial trenches. The dismantling of the cement _platea_ around the _podium_ revealed a black and white mosaic below it, dating to the beginning of the 1st century A.D. In the ambulatory surrounding the _podium_ cleaning continued of the floor which had emerged below the 3rd century A.D. mosaic, of which the mortar make up was preserved. On the basis of the materials found in the stratigraphic sequence the construction of the make up was dated to the mid 2nd century A.D.