Lillebonne is located on the north banks of the Seine River. From the first to the third centuries AD the town, then called Juliobona by the Romans – a homage to Julius Cesar, was a very prosperous port. The relatively well preserved Roman amphitheatre (capable of holding 3,000 persons) and baths are all that remains from these times. Many Roman and Gallic relics, notably a bronze statue of a woman and two fine mosaics, have been found and transported to the museum at Rouen. The Roman town was abandoned at the end of the third century when it was invaded by barbarians.
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.