Gwynedd Archaeological Trust
Regional Historic Environment Record

Standing Stone, Y Werthyr, Amlwch

Primary Reference Number (PRN) : 3541
Trust : Gwynedd
Community : Amlwch
Unitary authority : Ynys Mon
NGR : SH4152492866
Site Type (preferred type first) : PREHISTORIC STANDING STONE
Status : Scheduled Monument

Description :
There is also, in the adjoining fields, a large stone measuring about 10ft above ground. In the time of the former proprietor of the place, there was another stone of the same size, some distance from it, and a huge flat stone extending from one to the other. The old country people stood in great awe of it, and considered it an act of sacrilege when Mr. Williams destroyed the top stone and one of the pillars. <1>

At Werthyr, a mile and 3/4 W of Amlwch Church, a mean hir stands in a field almost opposite the farmhouse of Bryn Llwyd. It is an irregular slab of local chloritic mica schist 9ft 6ins in height, 5ft 2ins in width, and from 19 to 28ins in thickness. The alignment of the SE side of the stone is to the Summer Solstice sunrise. It has been marked on all ordnance surveys. <2>

Maen Hir, 800yds NE of the Werthyr earthwork. 9 1/2ft high, by 5ft by 1 1/2ft. Good condition. (RCAHMW, 1937)

SH 41529286 standing stone (LB). <4>

The standing stone is as described. Published survey 25" correct. <5>

Condition unchanged. <6>

Erect stone 9' 6" high 5' wide and 18" thick, standing in a grass field just over 1 1/2m W of the parish church and 250yd NE of Werthyr farm. No trace of surrounding mound. <7>

Massive stone on a flat topped local summit with good views all around - antiquarian ref (Rhys. J. 1882 Arch Camb) suggests that another stone stood nearby and they were joined by a large capstone. There is no sign of the other remains. As described elsewhere - no change from description in Inventory (SMR ref 3) Site stands on a rounded rise - with views from all sides. There may be subsurface survival as ground does not appear to be unduly disturbed. NB land owners could not be contacted - site described from roadside. (Smith, 2003)

The monument comprises a massive standing stone, probably dating to the Bronze Age (c.2300 BC - 800 BC) and situated within enclosed pasture about 200m to the NE of Werthyr Farm. The standing stone measures about 3m in height, 1.8m in thickness from NE to SW by 0.8m in width. Several packing stones are visible around its base. <10>

Sketch of Maen Hir Llanol (Skinner, 1802).



Sources :
Cooke, N. , 2014 , Rhyd-y-Groes Repower, Anglesey: Cultural Heritage Assessment. ( © Wessex Archaeology)
Hadley, A. , 2016 , Proposed Wind Turbine at Nant-y-fran, Cemaes, Isles of Anglesey. Cultural Heritage Impact Assessment. ( © Archaeology Wales)
Skinner, Rev J. , 1908 , Ten Days' Tour Through The Isle of Anglesea, December 1802
Smith, G. , 2003 , Prehistoric Funerary and Ritual Monument Survey: West Gwynedd and Anglesey ( © GAT)
Smith, G., and Steele, N. , 2005 , Pan-Wales Prehistoric Funerary and Ritual Sites Survey: Trial Data Synthesis ( © GAT)
The Royal Commission on the Ancient and Historical Monuments of Wales , 1937 , An Inventory of the Ancient Monuments in Anglesey
Rhys, J. , 1882 , Archaeologia Cambrensis , <1>
Baynes, E. N. , 1910 , Transactions of the Honourable Society of Cymmrodorion , <2>
Ordnance Survey , 1963 , SH49SW , <4>
Ordnance Survey , 1968 , SH49SW 1 , <5>
Ordnance Survey , 1969 , SH49SW 1 , <6>
, PRN 3541 , <7>
Lynch, F. , 1970 , Prehistoric Anglesey , <8>

Events :
40526 : Prehistoric Funerary and Ritual Monument Survey: West Gwynedd/Anglesey (year : 2003)
45013 : Rhyd-y-Groes Repower, Anglesey: Cultural Heritage Assessment. (year : 2014)
40527 : Pan-wales Prehistoric Funerary and Ritual Sites Survey: Trial Data Synthesis (year : 2005)
45130 : Proposed Wind Turbine at Nant-y-fran, Cemaes, Isle of Anglesey. Cultural Heritage Impact Assessment. (year : 2016)

Related records
National Monuments Record Wales NPRN 302471 https://coflein.gov.uk/en/site/302471/

Compiled date : 31-03-2000


The above data are supplied by GAT in partnership with its Local Authorities (Anglesey, Conwy and Gwynedd County Councils, and Snowdonia National Park Authority), © GAT 2025 (and in part © Crown, 2025 - as indicated)
This information is supplied for the purposes of personal interest only and may not be used as part of a commercial project.

March 29, 2025, 2:28 am - HTML file produced from Gwynedd Archaeological Trust Regional HER
Gwynedd Archaeological Trust, Craig Beuno, Garth Road, Bangor, Gwynedd.  LL57 2RT
tel (01248) 352535,  fax (01248) 370925, email her@heneb.co.uk, web www.heneb.co.uk