Caergwrle Castle is located in the town of Caergwrle, in Flintshire, Wales. Believed to have been preceded by a hill fort, it was constructed in 1277 by Dafydd ap Gruffydd under the reward of King Edward I. The castle had notable features such as D-shaped towers and a circular keep. It was partially destroyed during Dafydd's revolt in 1282 but was restored by Reginald de Grey. Edward gifted the castle to his wife Eleanor of Castile but it suffered damage in a fire. Subsequent repairs were not made, and the castle fell into ruin. Caergwrle Bowl, an archaeological find from the Bronze Age, was discovered in the vicinity in 1823. Excavations were conducted in the late 20th century, and the castle ruins are now maintained by Caergwrle Community Council. The site is listed as a Grade I structure.
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.