Bornem Castle, also known as the De Marnix de Sainte-Aldegonde Castle, stands on the Oude Schelde, a tributary of the Scheldt. The earliest fortification on the site was of the 10th or 11th centuries and was intended to defend against the incursions of the Normans. A later castle was built on the foundations of the older building in 1587 by the Spanish nobleman Pedro Coloma, lord of Bobadilla, a follower of Alexander Farnese. The property was afterwards leased by the family de Marnix de Sainte-Aldegonde, who became the outright owners in 1773.
The present house was built on the same site at the end of the 19th century to plans by Hendrik Beyaert, after the remains of the 16th century building had been demolished. It remains in ownership of the house Marnix de Sainte-Aldegonde, the current resident is John de Marnix de Sainte-Aldegonde, 14th Earl of Bornem.
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.