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Castell Dyffryn Mawr

Also known as, or recorded in historical documents as;
Llanfair Nant Gwyn; Parc y Domen

In the community of Crymych.
In the historic county of Pembrokeshire.
Modern authority of Pembrokeshire.
Preserved county of Dyfed.

OS Map Grid Reference: SN17483517
Latitude 51.98489° Longitude -4.65931°

Castell Dyffryn Mawr has been described as a probable Timber Castle, and also as a Masonry Castle although is doubtful that it was such.

There are earthwork remains.

This site is a scheduled monument protected by law.


Ringwork, walled in stone slabs, probably laid in clay or poor mortar. No known history. (King)

A probable castle mound, subsequently modified as a landscape feature: a circular ditched mound, some 20m in diameter, rising 5.5m from base of the generally 3.0m deep ditch; the dished summit of the mound is defined by a roughly 1.6m wide stony bank: a recent bank, some 45m in diameter, surrounds the work, OS County series (Pembroke. XI.4 1889) portraying this bank as tree-planted, with a conifer(s?)on the mound. (Coflien)

This is a fine Norman mound ..., about 50 yards to the south-east of Dyffryn Mawr farm-house. It rises to a height of over 20 feet from the bottom of the surrounding ditch. The centre of the summit, which is 60 feet in diameter, has a saucer-like depression of some 10 feet. Around this basin are the stone foundations (5.5 feet wide) of what was probably the turret of an early manor house. The ditch is 8 feet wide and 10 feet deep ; the counterscarp is crowned with a thick quickset hedge. There are no signs of a bailey. The field on which the mound stands is still known as Pare y domen (Tithe Schedule, No. 357). In the spring of 1920 a narrow trench was driven into the west side of the mound, revealing two-post holes, each about one foot square, in the hard soil just outside the stone foundations. At the foot of each hole was a bed of decayed timber a foot thick. (RCAHMW)

The stone work may well be a drystone wall around the mound built to protect the trees recorded in Coflien when first planted, seems unlikely as a masonry castle and the isolated location may well put question on this being a castle site of any type. The presence of substantial timbers does mean some structure here and many authors have accepted this as a castle.
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Sources of information, references and further reading
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This record last updated 03/07/2016 20:13:41