The building time of Château du Hallier is not known precisely. It is recorded in the 15th century in deeds of sale. The castle was sold to Charles de l'Hospital in 1537. In the 18th century, the castle was used as a quarry; the square second floor disappeared. In the 19th century, the castle became a farm. One of the towers housed a potter's kiln until the early 20th century. Today castle is privately owned. It has been listed since 1967 as a monument historique by the French Ministry of Culture.
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.