The archaeological investigations for the underground stations (Lines 1 and 6) in Municipio square, in Naples, brought to light a sector of the harbour of Neapolis active from the Hellenistic period until Late Antiquity. At the beginning of the 5th century this area of the bay siltedup progressively and, as a consequence, the coast line advanced and the harbour moved towards east. The excavations of the stratigraphy concerning the silting up of the bay and the abandon/reuse of the surrounding buildings found a great quantity of pottery datable between the 5th and 7th centuries AD. In this report are presented the results of the archaeometric analyses conducted on a first selection of numerous samples of North African pottery, amphorae, coarse and cooking wares sherds. The studies carried out determine and circumscribe in most cases the production areas of the artefacts arriving from Tunisia, both from the Hammamet gulf and from workshops of the Tunisian Sahel.