Ancient Monuments

History on the Ground

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Castle Arnold

A Scheduled Monument in Llanover (Llanofer), Monmouthshire (Sir Fynwy)

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Latitude: 51.7849 / 51°47'5"N

Longitude: -2.9873 / 2°59'14"W

OS Eastings: 331991

OS Northings: 210043

OS Grid: SO319100

Mapcode National: GBR F6.YRMK

Mapcode Global: VH79F.5DLJ

Entry Name: Castle Arnold

Scheduled Date: 20 June 1947

Source: Cadw

Source ID: 2380

Cadw Legacy ID: MM086

Schedule Class: Defence

Category: Motte

Period: Medieval

County: Monmouthshire (Sir Fynwy)

Community: Llanover (Llanofer)

Traditional County: Monmouthshire


The monument comprises the remains of a castle mound, dating to the medieval period (c. 1066 -1540 AD). It consists of a large, long, oblong mound with relatively steep sides and a flattish top. It measures rough 87m E/W and 52m N/S, and is up to 4m high. The site is larger than a normal motte, and is likely to be natural in origin. Geophysical survey has revealed the presence of masonry structures on the summit of the mound. Historical references indicate that this was the fortified home of Seisyll ap Dyfnwal, the Welsh Lord of Gwent Uwchcoed.

The monument is of national importance for its potential to enhance our knowledge of medieval defensive practices. The monument is well-preserved and an important relic of the medieval landscape. It retains significant archaeological potential, with a strong probability of the presence of both structural evidence and intact associated deposits.

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

Source: Cadw

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