St. David's Church, or Llanfaes Church, consists of a chancel, nave, and a tower at the west end in which are six bells. In the aisle and chancel there used to be several stones to the memory of departed. There is a tablet in the church to the memory of the Rev. Theo. Evans, of Llangammarch, who afterwards became vicar of St. David's. This church was last restored in 1859, at a cost of £1,500, and contains a memorial window given by the late Colonel and Mrs. Church Pearce, in memory of their son. In 1808 three-quarters of an acre of land was consecrated for burial ground purposes by the Bishop of St. David's. The parish register dates from the year 1780.
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.