The Church of St Michael is situated on a hillside on the western side of the Hoffnant Valley. The precise date that the church was completed is unknown, but there is believed to have been an earlier church on the site during medieval times. The Church in Wales states that it is of 12th century origin, making it the oldest in the diocese of St. Davids. The roof is likely as old as the 15th century, though the porch is believed to have been added much later in the early 17th century. The windows were added in the early 19th century.
In 1887 the church was extensively renovated by D. Davies of Penrhiwllan, and it underwent another renovation 70 years later in 1957, possibly under A.D.R. Caroe. The interior is whitewashed, and features slate floors. The Royal Commission on the Ancient and Historical Monuments of Wales notes that the limestone square in the interior dates to the original building of the 12th century, and that the square font and font in the porch also date to the medieval period.
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.