Although the St Augustine's Church dates from 1108, a religious presence is thought to have existed at the approximate location for around a century prior to this. The oldest surviving part of the building, the west doorway, dates from c. 1200. The building was enlarged in 1470, when a nave, tower and chancel were added. The church unusually allowed for the wives of deceased clergymen to hold its living– a Katherine Morgan of Llanrumney Hall did so in 1603. The church was extensively refurbished in the late 19th and early 20th Centuries. The churchyard is believed to have been cleared of ancient burials at some point during the mid-19th Century, as no extant stone is older than this. The tower's clock was installed in 1962. Most of the church's stained glass dates from 1915 (the work of Charles Eamer Kempe), though the pair of Te Deum windows were not added until 1950.
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.