Rhoon Castle as we know today was built in 1430 by Pieter the Seventh of Duiveland. He was a descendant of Biggo van Duiveland, who built the original castle which dated back to 1199. The coats of arms of the many illustrious families who lived in the castle can be seen in the stained-glass windows in the Catharina Theresia Room. Thoroughly restored in 1975, the castle is now regarded as one of the most beautiful restaurants in the Netherlands.
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.