The Château de Frauenberg dates from 1350 and occupies a site dominating a valley between France and Germany. It was owned by several families, including the lords of Sierck and the counts of Eberstein. Over time, it was altered and renovated, with significant construction in the 13th, 14th, 17th and 18th centuries.
It had been dismantled by Cardinal Richelieu in 1634 and was partly destroyed by fire in 1786. On the eve of the French Revolution, the land was bought by Count Gravier de Vergennes (1719-1787), minister of Louis XVI. The castle housed two pottery kilns which operated in Frauenberg from 1785 to 1791 and were the origin of the notable ceramics company, Villeroy & Boch.
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.