Ancient Monuments

History on the Ground

This site is entirely user-supported. See how you can help.

Castell Cwm Aran

A Scheduled Monument in Llanddewi Ystradenny (Llanddewi Ystradenni), Powys

We don't have any photos of this monument yet. Why don't you be the first to send us one?

Upload Photo »

Approximate Location Map
Large Map »

If Google Street View is available, the image is from the best available vantage point looking, if possible, towards the location of the monument. Where it is not available, the satellite view is shown instead.


Latitude: 52.3239 / 52°19'25"N

Longitude: -3.2444 / 3°14'39"W

OS Eastings: 315282

OS Northings: 270260

OS Grid: SO152702

Mapcode National: GBR 9W.VMW3

Mapcode Global: VH693.QV5D

Entry Name: Castell Cwm Aran

Scheduled Date:

Source: Cadw

Source ID: 1944

Cadw Legacy ID: RD095

Schedule Class: Defence

Category: Motte & Bailey

Period: Medieval

County: Powys

Community: Llanddewi Ystradenny (Llanddewi Ystradenni)

Traditional County: Radnorshire


The monument comprises the remains of a motte and bailey castle, a military stronghold built during the medieval period. A motte and bailey castle comprises a large conical or pyramidal mound of soil or stone (the motte) surrounded by, or adjacent to, one or more embanked enclosures (the bailey). Both may be surrounded by wet or dry ditches and could be further strengthened with palisades, revetments, and/or a tower on top of the motte. In this case the motte is roughly rectangular with a summit measuring c.38m by 20m. It stands 15m high above the valley to the south and east, and 9.5m above a rock-cut ditch to the west and north. Across the ditch, to the north of the motte, lies a trapezoidal bailey c.47m by 49-62m, which is surrounded by banks on all four sides. The banks are accompanied by outer ditches on the west and north; the position of a ditch is represented by a scarp along the valley slope on the east, and on the south the ditch is shared with the motte. On the north and west the bailey bank stands c.3-4m above the base of the ditch. An outer counterscarp bank, with a small tump adjoining its southern end, runs along the west side of both the motte and bailey ditches, while there are hints of a further enclosure c.20m deep to the north of the bailey. Across the stream to the south-south-east of the motte, earthen platforms are visible on two levels. It has been suggested that these would be well placed to house siege equipment during an attack on the castle. The site was one of the seats of the Mortimer family in Maeliennydd, and is mentioned frequently in historical sources in the mid- to late-12th century. Its end is uncertain, but it may have been abandoned in favour of Tinboeth nearby. There is no sign that the original earthwork structure was ever refurbished in stone.

The monument is of national importance for its potential to enhance our knowledge of medieval defensive organisation. The well-preserved monument forms an important element within the wider medieval context and the structure itself may be expected to contain archaeological information relating to chronology, building techniques and functional detail.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

Other nearby scheduled monuments is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact for any queries related to any individual ancient or schedued monument, planning permission related to scheduled monuments or the scheduling process itself. is a Good Stuff website.