First mentioned in 1349, but possibly older, Buben castle was home of the knights of Buben (means literally 'drum'), and held it´s name even under other owners. The family sold their first castle around 1378 (they had other castles then), but they use the family name Buben until today. The castle often changed owners together with the surrounding lands, it wasn´t used for living because of it´s isolated position in the 16th Century, and began to deteriorate but only slowly, because there was nobody around to disassemble the stone for their own use. It was a partial ruin in 1912, when first larger repairs were made by the Czech tourist club. A through conservation was done in the 1930ies, but a very unprofessional repair was done in 2010 with modern materials, which destabilized the repaired parts and a bastion completely collapsed in 2013. because the used concrete sucked in too much water and became too heavy for the old wall. The future for now is unsure.
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.