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The Castle

At present, we don't have any definite data neither about the origins nor about the appearance of the first castle on Mount St. John. Excavations have revealed Gallo-Roman substructures below the medieval fortifications.
The first castle belonged to the lords of Gymnich and was located in Dudelange. It was destroyed around 1400 by the Duke of Bar.
The construction of the castle had begun in the early 15th Century. The walls uncovered during the excavations show significantly different construction periods culminating in the castle of the 16th Century (Gothic and Renaissance).

The Lords of Gymnich, Boulay, Neufchâtel, Hunolstein and Isembourg invested lavishly in the fortification and luxury of their castle. It was destroyed in 1552 under Charles V and lost all strategic value.

Subsequently, the ruins were used as a quarry for the nearby villages. In the 1970s, the Friends of History of Dudelange and Mount St. John dug out the remains of the castle and uncovered the foundations of various towers, the palace, houses, stables and outbuildings; three wells and a cistern were partially excavated. The moat and the access to the castle are still visible.

However, the castle still holds many legendary secrets like that of the Virgin of Mount St John, who -transformed into a snake- awaits her saviour every seven years.

Gymnich Isembourg - Isenburg Dudelange - Düdelingen