In Roman times the Bruckneudorf area was already densely populated, and Villa Bruckneudorf, one of the most important Roman villas to be discovered in Eastern Austria, is a few kilometres to the east. The villa is presumed to be a residence of the imperial family in the autumn of 375 AD. Today impressive ruins remain. Of the magnificent mosaics, more than 300 m² are still preserved. These are located in the Landesmuseum in Eisenstadt.
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.