Situated in the port of Pornic, Château de Pornic has long been a symbol of the town. The castle is privately owned and not open to the public. The castle is bordered on one side by the sea and is constructed on a defensive site. In the Middle Ages, it provided for the defence of the port.
In the 10th century, Alan Wrybeard, Duke of Britanny, built and fortified a wooden castle. It was occupied by a garrison who protected the entrance to Pornic. In the 12th century, it was the property of the Lords of Rais who rebuilt it in stone. In the 15th century, it belonged to Gilles de Rais but was confiscated by the Duke of Britanny at the time of his trial. In the 18th century, it belonged to Marquis de Brie Serrant whose properties were confiscated during the French Revolution. The castle fell into ruin. The castle was bought at the end of the 19th century by Monsieur Lebreton, founder of the seawater baths, and restored by the architect François Bougoüin who gave it its present appearance with its fully arched windows dressed in brick in the style of the Italian architecture of the Château de Clisson.
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.