Chûn Castle is a large Iron Age hillfort (ringfort) near Penzance in Cornwall. The fort was built about 2,500 years ago, and fell into disuse until the early centuries AD when it was possibly re-occupied to protect the nearby tin mines. It stands beside a prehistoric trackway that was formerly known as the Old St Ives Road and the Tinners’ Way.
The fort was excavated in 1895, 1925, 1927 and 1930. Much pottery was uncovered; the earliest was dated to the 4th century BC due to its similarity to known Breton pottery of that age. But the fort may have been built upon a much older structure. Chûn Quoit, around 800 feet to the west, is dated to around 2400 BC. It is believed that the fort fell into disuse around the first century AD but was reoccupied and modified several centuries later, until the 6th century. However, occupation may also date to the later Roman 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.