Schönau Abbey was a Cistercian monastery founded in 1142 from Eberbach Abbey. The present settlement of Schönau grew up round the monastery. By the end of the 12th century Schönau was already in use as a burial place of the Staufen family: in 1195 Conrad of Hohenstaufen, Count Palatine of the Rhine, was buried here, as were his son of the same name, probably in 1186, and both his wives. Adolf, Count Palatine of the Rhine (d. 1327), Rupert II, Elector Palatine (d. 1398) and other members of the family were also buried here. Conrad II, Bishop of Hildesheim, died here and was presumably also buried here. In the 14th century Schönau was also the burial place of the Counts of Erbach.
During the Reformation the abbey was dissolved, in 1558. The empty buildings were occupied in 1562 by Huguenot refugees from Wallonia, to whom Schönau gave rights of residence.
Physical remains of the abbey include the abbey church of c. 1230, and also the abbey gateway (c. 1200), the former refectory, and the 'Walloon forge' (the former abbey forge, renovated by the Huguenot refugees from Wallonia after 1558).
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.