This Scheduled Monument is a good example of a small enclosed settlement of Iron Age or Romano-British origin, of particular interest because of the survival of both the enclosure earthworks and interior building platforms (most sites of this type have been ploughed out).

Situated on a shelf on east facing slopes, immediately overlooked on the west by higher ground. The work is nearly circular in plan and measures 90m in overall diameter. It comprises a rampart 10m in width and 1m high internally, best preserved on the west (uphill) side and having an outer ditch 6m in width, 0.5m in depth, elsewhere this is reduced to an outward facing scarp up to 2m in height with no traces of an outer ditch. No internal features are visible and position of entrance not obvious.  Spur site in pasture. Interior slopes downwards to the east. The site is overlooked completely on the west side and a military function is out of the question. The earthworks are completely degraded consisting of a low spread bank with a slight ditch on the west, the bank being reduced to a scarp on the other sides. Entrance possibly on the north side in the centre.  On the N side where I Burrow suggested an entrance, a path crosses the bank. Internally - there are no internal features. If the entrance was not on the N side, it is not clear where it might have been. Scheduling description:

The monument includes the earthwork and buried remains of a small enclosed settlement which is either Iron Age or Romano-British in origin. It is situated on gently sloping ground to the east of the summit of Castle Idris, overlooking the Clun and Folley Brook valleys. From this location there are extensive views of the surrounding hills. Other small enclosed settlements in the vicinity which are broadly contemporary include an example on Fron, 1km to the east, and Caer-Din Ring, 2.6km to the north.

The small enclosed settlement on Castle Idris takes the form of a D-shaped enclosure. Its overall dimensions are approximately 100m north-south by 108m east-west, and its internal area is about 0.35ha. The earthworks which define the interior of the settlement consist of a bank and an external ditch. They have been modified to some extent by ploughing over the centuries. The bank is between 10m and 14m wide, and for much of its length the outer face survives as a pronounced scarp between 1.4m and 2.2m high. Around the eastern half of the circuit the top of the bank has been mostly levelled by ploughing. To the west the bank stands up to 1.4m high internally. The ditch has largely been infilled, and is still visible in places as a shallow depression between 5m and 8m wide. It survives well as a buried feature. Within the interior of the enclosure are a number of platforms, which provided level areas for the construction of buildings.

source: www.discovershropshire.org.uk