Arras was founded on the hill of Baudimont by the Celtic tribe of the Atrebates, who named it Nemetacum or Nemetocena in reference to a nemeton (sacred grove) that probably existed there. It was later renamed Atrebatum by the Romans, under whom it became an important garrison town. The archaeological site Nemetacum in Arras is one of the rare sanctuaries devoted to the oriental god Attis in France.
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.