Margam Castle is a Victorian era country house built for Christopher Rice Mansel Talbot. Designed by Thomas Hopper, the castle was constructed in a Tudor Revival style over a ten-year period, from 1830 to 1840. The site had been occupied for some 4,000 years. A Grade I listed building, the castle is now in the care of Neath Port Talbot County Borough Council.
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.