The site is of Manordeifi Old Church thought to have been occupied by a church since the 6th or 7th century, dedicated to Llawddog, a Celtic saint. From the evidence of an inscription on the bell, it is believed that it was later dedicated to Saint Lawrence. When the parish was created in the 12th century, the dedication was changed to Saint David. The nave and chancel of the present church date from the 13th or 14th century, and the porch was added at a later date. It was probably altered in the 18th century, and repaired between 1835 and 1844. It was abandoned as a parish church in 1899. The church was repaired in 1905 and again between 1948 and 1973.
The church is constructed in stone and has slate roofs. Its plan consists of a nave and a chancel, with a large west porch, a north vestry, and a single bellcote at the west end. The interior is plastered and whitewashed. The floor of the nave is paved with slates and there is a three-sided altar platform in the chancel. The church contains box pews, four of them being larger for the use of the more prominent local families; the two easternmost of these are furnished with fireplaces. Elsewhere are open-back benches. The pulpit is plain and is partly built into one of the pews. The font is square on a circular shaft and a square base. The font dates from the 13th century, while the bell is from the 15th century. In the church are a number of monuments, one of which commemorates Charles Colby who was killed by a tiger in India in 1852. Another is to the memory of the Welsh poet John Blackwell who died in 1840 and is buried in the churchyard.
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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.