Château de Brou was built in the second half of the 17th century by Paul-Esprit Feydeau, the Royal intendant. Important changes were made in the 18th century including the removal of a monumental staircase in the hall to allow to give more room to the bedrooms on the 1st floor. Instead, two staircases were built on the north side at each corner of the two wings of the castle. The dovecote is probably the oldest building on the property. Built in 1545, it stands on a circular basement with a central pillar. In 1844 the estate was sold due the Feydeau family had no descendants. It was acquired by Charles-Floréal Thiébaut. Since then, Château de Brou has remained in the possession of the same family.
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.