The abbatial complex of the Saint Eufemia was founded by Robert Guiscard in the second half of the 11th century in the place of an ancient Byzantine monastery. Present archaeological investigations concern the church, with the focus on the area of the great presbytery and the main apse. In this part, 3-4 m deeper than the ground level (that has risen in time due to the frequent floods of the Bagni river) a polychromatic tessellated marble pavement decorated with geometric patterns of Norman origins was located. In the same site, the outer walls and the pillars supporting the barrel roof were also discovered. The remains of the altar, deprived of marble covering, stand on a raised marble rectangular tribune, in the center of the apse. The semicircular part of the main apse lies under the local road passing near the church.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.