The sign reads:

CITY WALLS IN THE SOUTHERN SECTOR (2nd century BC)

The defence system in the southern sector of the Neapolis underwent diverse reforms over time and some of the architectural remains of the different building phases are still preserved.

In the city, under the more modern structures, there are still elements of the 5th century BC defence system, next to the area of the acropolis. Later, in the 4th century BC, a new section of wall was built, with towers and moat, which were almost completely dismounted to construct the wall you can see today.

In the 3d century BCE, a proteichisma was built, and outer protective wall to reinforce the 4th century BCE wall, which was also partially dismantled at a later date. The walls that still stand were built in the mid 2nd century BCE and have two towers that protect the main gate into the city from the south as well as a third tower at the southwest corner.