Lincluden Collegiate Church is a ruined religious house, situated to the north of Dumfries, Scotland. Situated in a bend of the River Cairn, at its confluence with the River Nith, the ruins are on the site of the Bailey of the very early Lincluden Castle, as are those of the later Lincluden Tower. This religious house was founded c. 1160 and was used for various purposes, until its abandonment around 1700. The remaining ruins are protected as a scheduled monument.
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.