The Château de Courcy was mentioned in 1091, when it was owned by Richard de Courcy and besieged by Robert Curthose. At the start of the 17th century, the castle was demolished by order of Richelieu and, losing all military function, slowly became an agricultural enterprise. In 1975, the remaining parts of the former castle including the gate on the road from Tôtes and the gateway to the second enceinte were protected by being added to the supplementary inventory of historical monuments. In spite of this protection, the condition of the site has continued to deteriorate.
The first castle in Courcy was probably built of earth and wood. The structure of the fortification was conceived as a succession of three enceintes (French term used for the inner ring of fortifications), but only the last remains. Surrounded by moats, the last enceinte was about 10 m high and defended by twelve towers, of which only nine round towers remain, and a square tower which probably served as a keep. Elsewhere in the enceinte are the remains of the Saint Catherine chapel. It was built in the 12th century but greatly remodelled in the 15th-16th centuries.
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.