Set on a hilltop surrounded by vineyards and cypresses, the Gallo-Roman villa of Séviac was a luxurious residence, spread over almost 6500m2. It is today one of the largest Gallo-Roman villas known in the south-west of France. The villa was built in the 2nd century AD and reconstructed in the 3rd and 4th centuries. Later in the 8th and 9th centuries the place was used for a church, burials and necropolis. The villa is distinguished by its exceptional set of Roman age mosaics (over 625m2) and vast baths.
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.