There still exists, by the gate leading to Bovianum, an important inscription of about 168 AD, relating to the tratture (see Apulia) in Roman days, forbidding the natives to harm the shepherds who passed along them.

[5] The archaeological area of Saepinum, approximately 12 hectares wide, is surrounded by a wall in which four monumental gates open, located at the entrance to the two main road arteries, each flanked by two circular towers.

The perimeter of the walls is made up of a sequence of curtains, always rigidly rectilinear and of variable length, interrupted by circular towers arranged at a distance of 80 - 120 feet from each other.

The facing of the curtains has a uniform thickness (approximately 1.80 m) and is woven with the reticulate technique, with a homogeneous cement mortar.

The four doors that open at the junction of the two main road arteries, the cardo and the decumanus, conventionally take their name based on their orientation; they repeat the same planimetric scheme in the layout, the classic one of the city gate with a single round arch, approximately m high.

To the left of the door a stone staircase leads to the patrol walk on the city walls, and to the maneuvering room of the portcullis.