Ancient Monuments

History on the Ground

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Castle Mound

A Scheduled Monument in St. Ishmael's (Llanisan-yn-Rhos), Pembrokeshire (Sir Benfro)

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Latitude: 51.7254 / 51°43'31"N

Longitude: -5.1361 / 5°8'10"W

OS Eastings: 183502

OS Northings: 207619

OS Grid: SM835076

Mapcode National: GBR G3.YH4L

Mapcode Global: VH1RP.XWLP

Entry Name: Castle Mound

Scheduled Date: 8 June 1950

Source: Cadw

Source ID: 345

Cadw Legacy ID: PE196

Schedule Class: Defence

Category: Motte

Period: Medieval

County: Pembrokeshire (Sir Benfro)

Community: St. Ishmael's (Llanisan-yn-Rhos)

Built-Up Area: St Ishmael's

Traditional County: Pembrokeshire


The monument comprises the remains of a motte and ditch, dating to the medieval period (c. 1066 -1540 AD). A motte is a large conical or pyramidal mound of soil and/or stone, usually surrounded by either a wet or dry ditch, and surmounted by a tower constructed of timber or stone. The motte measures 35ft in diameter across the top and 15ft high. It is surrounded by a ditch 20ft broad. The east side of the mound is somewhat hollowed away.

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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