The Church of St. Lawrence was built in the 1380s to replace an earlier wooden church. The tower has been added in 1467, and the wall paintings are from the beginning of the 16th century. The church has been reconstructed in the 17th century and the beginning of the 18th century. The remodeling has been done in the 19th century. The altarpiece was painted by B. Reinhold in 1876. The bell dates from the beginning of the 13th century.
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.