An archaeological investigation was made of the church dedicated to San Celso, built on the line of one of the decumani of the colony. The remains of numerous walls came to light below the floor of the church. Both of opus reticulatum and opus latericius these walls related to a number of buildings and a portico facing onto the decumanus. The brick built portico must have been covered by a barrel vault. A stair opened in its north wall, inserted between two opus reticulatum walls, which must have led to the first storey of a building of Augustan date, destroyed by the construction of the church.

The cement make up for the road was uncovered in which a cut was identified containing a lead fistula. This bore an inscription, no earlier than the 3rd century A.D., relating to the vir clarissimus Acilius Glabrio and the clarissima femina Maecia Praetextata, probably to be linked to one M. Maecius Memmius Furius Baburius Caecilianus Placidus, vir clarissimus, consul in 343 A.D. and patron of Puteoli. Another fistula aquaria from the Flegrean area can also be linked to this individual. Therefore, this was a gens which, like the Marii of Herculaneum, owned a workshop for lead working. Moreover, the pottery finds provided a terminus post quem which indicated that this sector of the acropolis was abandoned during the second half of the 3rd century A.D.