The first mention of the Tongelaar Castle on this site dates from 1282 when it was dedicated to Count Floris V by Jan van Cuyk. The Van Cuyk family was probably owner of the castle until somewhere in the 15th century when it was owned by the Van Merwick family. In later centuries ownership of the castle passed through several noble Dutch and Belgian families until the 20th century.
The only medieval part of Tongelaar Castle is the square brick tower. This was originally the gate tower and would have been equipped with a drawbridge. The large window would have been the entrance. This tower dates back to the early 15th century. Archeological research proved that there had been a fortified medieval building at the opposite side of the gate tower but that they had not been connected by walls with each other. The tower would have had several living quarters and had a prison below ground level.
All the other present buildings were built in the 18th and 19th century. The western wing was either built on the foundations of an earlier building or built with the use of old building materials.
The tower is now a corner tower of a closed square farm with a simple courtyard.
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.