Mulfra Quoit is a Neolithic dolmen in the county of Cornwall in England. It stands on Mulfra Hill to the north of the hamlet of Mulfra.
Mulfra Quoit is similar to Chûn Quoit five kilometers away. The quoit has three 1.7m-high support stones, arranged in a U-shape 3.0m long and 1.7m wide, and open on one side. The capstone, which has slipped down, measures 3.2m by 3.0m, and is almost square; it has a weight of 5 tonnes. Since some of the stones that formed the chamber are missing, it is difficult to get an idea of its original form, but it is possible that four pillars supported the capstone slab as with Chûn Quoit. On the other hand, the capstone has a central bulge on its underside, which would give the stone a stable position on the existing three pillars. Mulfra Quoit was apparently covered by a mound, the remnants of which are still present.
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.