Haus Busch was built in early medieval times, although the exact date is unknown. Today it is still unfinished, as planned reconstruction in the 18th century was not completed. The entire house is rectangular and encloses a large courtyard. The first owner, as far as can be ascertained, was the land-owner Beissel von Gymnich. In the 15th century ownership was transferred via marriage to Michael von dem Bongart. At the end of the 17th century the building was acquired by the von Groote family, who also planned the grandiose reconstruction which was never completed. In the mid-19th century Haus Busch was sold to a wealthy individual, whose descendants are the present owners.
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.