Comburg was a Benedictine monastery founded in the late 1070s by the Counts of Comburg-Rothenburg on the site of their castle. The first monks were from Brauweiler Abbey, but in the 1080s an abbot from Hirsau Abbey was appointed, and this brought Comburg into the movement of the Hirsau Reforms.
The monks of Comburg were exclusively of noble birth, and accordingly resisted the Benedictine reforms of the 15th century, under the pressure of which the monastery became a collegiate foundation in 1488, rather than admit non-nobles to the community.
In 1587 Comburg was mediatised by Württemberg, which brought to an end its status as an Imperial abbey.
The community was secularised in 1803. The library survives in the Württemberg State Library, but the church treasure was melted down in the Ludwigsburg mint.
The buildings have had a number of uses since then. Until 1909 a regiment of invalid soldiers was based here. During World War II the site was used for a variety of training purposes and also at one point as a prisoner of war camp. After the war it was used briefly for housing displaced persons, but since 1947 it has housed a teacher training establishment.
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.