The existence of a fortification at the site of Mehun-sur-Yèvre dates from antiquity. The major remains are of the early 13th century and the later 14th century. The present standing ruins date from a castle founded under the Courtenays after 1209. This fortress was transformed into a princely residence by John, Duke of Berry in 1367. Largely ruined in the 18th century the castle represented an excellent example of late Gothic architecture and early Renaissance architecture. Charles VII of France, died in the castle on July 22, 1461.
The castle is built on a trapezoid plan, and originally had a tall cylindrical tower at each corner and a rectangular tower in the middle of one of the long sides. An entrance was formed in the wall between two of the towers. One tower (12m diameter) was much larger than the others (8m) and served as the keep. The keep and the west tower still stand to their full height, each capped with intricate defensive machicolations. Manuscript illustrations indicate that the castle also had a large chapel above the principal entrance.
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.