Kirkistown Castle is an impressive three-storey tower house, built in 1622 by Roland Savage, a Norman landlord, at the site of a ninth-century round tower. It was occupied until 1731, when it was deserted. It post-dates the Plantation, but is fully in the late medieval tower-house tradition. Parts of the bawn wall survive with three-quarter round flanker towers at the angles. The tower was remodelled in Gothic style in 1800 by a Col. Johnston, and in 1836 some further work was performed by a very young Master Montgomery of Grey Abbey. The building was left, however, with a partial roof and broken windows, and the elements soon returned it to disrepair.
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.