While the site of the Dudelange castle ruins bears traces of Gallo-Roman structures, the first evidence of a castle in the area is in Dudelange itself where a castle belonging to the Lords of Gymnich was destroyed around 1400 by Robert de Bar. At the beginning of the 15th century, work began on building a fortified castle which was completed early in the 16th century with Gothic and Renaissance influences. The finely cut stones and sculptures show how much the lords of Gynmich, Boulay, Neufchâtel, Hunolstein and Isembourg invested in their luxurious fortress. However from 1542 the castle was taken and retaken when Francis I and Henry II of France were at war with Emperor Charles V. In 1552, the castle was destroyed and deprived of any strategic value. Thereafter the ruins were used as a quarry for the surrounding villages.
Since the 1970s, the Amis de l’Histoire de Dudelange et du Mont Saint-Jean (Friends of the History of Dudelange and Mont St. Jean) have explored the ruins, discovering the foundations of several towers, the palace, living quarters, stables and outhouses. Three wells and a reservoir were partly unearthed. The ditches and the entrance to the castle can still be seen.
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.