Elst castle ruins in Duffel is one of the oldest buildings in the province of Antwerp. The oldest reference dates from the 12th century. At that time castle was owned by the brothers Hildincshusen. From 1356 until the French Revolution in 1789 the castle was owned by the Tongerlo Abbey and was inhabited by the steward. It was also used as a residence for the nobility. In 1584 the castle burned down and was then rebuilt. In the late 16th century it was a vicarage.
According to 17th- and 18th-century drawings Elst castle was a large building surrounded by moat and gardens. In 1799 the castle was sold to Louis Hermans showed demolish three of the four main buildings of the complex and restored the wing part with the towers. During the First World War the castle was badly damaged.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.