Château de Quintin was mentioned as 'castellum novum' in 1202 and it was probably a fortified manor built in the late 1100s by Alain de Penthièvre. Geoffroy I Boterel built the first actual castle in the middle 1200s. it consisted of a moat, four gates, curtain walls and towers. The castle was badly damaged in the Wars of Religion (1590s).
The next castle was built as a living residence in 1643 and restored in 1785-1790. During the Great Revolution Château de Quintin was used as a prison. Since 1935 it has been owned by Bagneux family.
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.