In the 2nd century AD, the city-sanctuary of Gisacum extended near Saint-Aubin, which was gradually abandoned until disappearing in 5th century. In the 1801 archaeological excavations uncovered this important Gallo-Roman site; but in reality at the time the town covered an area of 250 ha. The interpretation centre has a permanent exhibition tracing the history of Gisacum, and the archaeological garden offers an original development of the thermal baths, which helps to visualise the disappeared monuments, in a pleasant landscape setting.
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.