The 'lower castle' served as a residence for the Counts and later The Princes of Celje during the 14th and 15th century. It was separated from the town settlement by battlements and a defence ditch. After the extinction of The princes of Celje in the 15th century, the court was used as an office of the Habsburg caretakers and was transformed into a barracks in the 18th century. The building we know today has undergone many radical changes, most of them during the reign of Empress Maria Theresa.
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.