Château du Guildo dates from the 11th century, when there was a fortified manor, probably made of wood. The stone castle was built in the 13th century in three phases. It was destroyed a century later and the new castle construction began in the late 1300s. Later it was restored as a living residence, but badly damaged in the late 1400s during the French-Breton War. The castle took part also to the Wars of Religion, when it was surrounded several times by Catholic League. This caused the final destruction Château du Guildo.
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.