The Abbey Church of Otterberg was founded in 1143 by Cistercians as the abbey church of a daughter abbey of the Eberbach monastery. In the 15th century, the monastery slowly declined. In 1504, and in 1525 during the Peasants' War, the monastery was burned and plundered. At the end of the 16th century, the abbey church began to be used simultaneously by the Catholic and Protestant parishes, but not without causing disputes. In 1708, therefore, a separation wall was built between the two spaces. The choir hall with the transept is now used as the Catholic part, the remaining nave as the Protestant part. In 1979, the wall was removed as part of a major renovation, but the structure of the property was not changed.
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.