The Château de Robert le Diable (also known as Château de Moulineaux) was a feudal castle from the time of the Dukes of Normandy. It is named after Robert the Devil who was also known as Robert de Montgomery and Robert le Magnifique ('the magnificent'). He was the Duke of Normandy and father of William the Conqueror. However, there is no evidence that this person was involved in the construction.
The castle was built during the 11th and 12th centuries. It stands on a hill which dominates the River Seine, the view extending over the whole Rouen region, making it a particularly strategic location. It is known that the English King Richard I ('Lionheart') stayed here. His brother, King John ('Lackland') destroyed the castle during his struggle with the King of France Philip II Augustus. The castle was rebuilt in 1378 by the Lord of Sefton. During the Hundred Years War, the people of Rouen destroyed the towers to prevent the castle being used by the English. Half ruined, it is today furnished with various artefacts as well as reconstructed scenes of local history and life in the Middle Ages. The castle is privately owned.
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.