Auchterhouse Castle is a 13th century castle located northwest of Dundee, Angus. The original castle was enclosed with walls, towers, and contained a keep. The castle may have been in ownership of the Ramsay family, who were hereditary Sheriffs of Angus. Sir William Wallace is alleged to have stayed at the castle and one its towers was named in his honour. King Edward I of England spent the night of the 20 July 1303 at the castle. The castle came into the possession of James Erskine, 7th Earl of Buchan who may have built the 17th century tower house.
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.