Dating the first half of the first century AD, has two doors, one post to cut the walls to the south, the other to the inner city to the north. Ellipsoidal, carved on the side of the heights of S. Peter, has the following dimensions: 40 x 69 m. minor axis, 95 x 80 m. major axis. On the arc of the north gate, has an inscription, which tells us the name of the illustrious person who has dedicated this monument to the city of Alba Fucens. On the left side of the city gate was found a villa that has the distinction of being cut by the construction of the amphitheater and was decorated with mosaics and frescoes that were then disconnected.
