Gwynedd Archaeological Trust
Regional Historic Environment Record

Bryngwyn Standing Stones, Brynsiencyn

Primary Reference Number (PRN) : 3135
Trust : Gwynedd
Community : Llanidan
Unitary authority : Ynys Mon
NGR : SH46246693
Site Type (preferred type first) : Neolithic STONE CIRCLE
Status : Scheduled Ancient Monument

Description :
The remains of a stone circle near Bryngwyn, 2 miles west of the old church, consisting of two large upright stones; one is 13ft high, 10ft wide and 2ft thick. The other is 10ft high, 9ft wide and 4.5ft thick. (RCAHMW, 1937)

Two large standing stones 3.25m apart - recorded by Henry Rowland in the 18th century as being part of a stone circle. He suggested a circle of 8 or 9 stones. For this and other refs. see Baynes 1910. <3>

Field in which stones stand was ploughed in 1991; said to be the first time for 40yrs but turned out to have been ploughed much more recently than this. MM & DT field walked it and found practically nothing. Stones not interfered with. <8>

The 2 stones are set at an angle to each other suggesting that if they were part of a stone circle, the circle lay to the NW. There is also a 3rd smaller stone set upright at the S side of the eastern stone however this was probably set up in recent times as a gatepost or part of a gateway. (Smith, 2003)

The geophysical survey did not detect anything that can be reliably interpreted as being associated with the reported stone circle. <11>

An evaluation excavation was carried out of an area north of the two standing stones at Bryn Gwyn, based on evidence from geophysical survey of the existence of a possible curvilinear feature there. No such feature was present but three standing stone pits were found of which two contained stumps of broken-off standing stones. Two stones lay in an arc in relation to the two extant standing stones that indicated a former stone circle of 8 stones and about 16m diameter. One standing stone was not part of this arc, but lay on a different alignment, possibly orientated on the nearby Castell Bryn Gwyn henge. (Smith, 2009)

Excavations in 2010 at the two standing stones at Bryn Gwyn, Brynsiencyn, Anglesey confirmed the former presence of a stone circle c. 16m diameter consisting of 8 stones. Fragments of some former standing stones remained while others had been removed entirely. Traces were also found of later use of the circle for cremation activity. (Smith, 2011) (Caseldine et al, 2013)

Two immense standing stones set about 4.6m apart. These are: a pointed slab 4.2m high, 3.2m wide and 0.6m thick; a more massive block 3.2m high, 2.9m wide and 1.5m thick, with a flat inclined top.

This has been the conjectured site of a druidical stone circle since the early eighteenth century at least, indeed Rowlands identified elements of two circles and the RCAHMW traced a ditch and bank. Excavations by the Gwynedd Archaeological Trust in 2008 and 2011 succeeded in confirming that the monument had originally been a stone circle.

In the eighteenth century the stones supported a cottage and its garden wall. More recently they have acted as gateposts. (Cooke, 2013)

Sources :
Caseldine, A. et al , 2013 , The Bryn Gwyn Stone Circle, Brynsiencyn, Anglesey , Archaeology in Wales : Vol. 52 : p. 23-38
Caseldine, A. et al , 2014 , The Bryn Gwyn Stone Circle, Brynsiencyn, Anglesey , Archaeology in Wales : Vol. 53 : p. 43-50
Cooke, R. , 2013 , Bodrida Wind Turbine, Brynsiencyn, Isle of Anglesey: Archaeological Desk Based Assessment ( © Aeon Archaeology)
Cooke, R. & Evans, R. , 2012 , Proposed Wind Turbine at Tre Ifan, Brynsiencyn, Anglesey: Archaeological Assessment ( © GAT)
Senior, M. , 2003 , The Standing Stones of north-western Wales
Senogles, H. , 1938 , Transactions of the Anglesey Antiquarian Society and Field Club.
Smith, G. , 2003 , Prehistoric Funerary and Ritual Monument Survey: West Gwynedd and Anglesey ( © GAT)
Smith, G. , 2009 , Bryn Gwyn Stones, Brynsiencyn, Anglesey. Evaluation Excavation 2008: Preliminary Report ( © GAT)
Smith, G. , 2011 , Bryn Gwyn Stones, Brynsiencyn, Anglesey. Excavation 2010 Preliminary Report ( © GAT)
Smith, G. , 2013 , The Bryn Gwyn Stone Circle, Brynsiencyn, Anglesey. Publication Report ( © 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
Baynes, E. N. , 1910 , Transactions of the Anglesey Antiquarian Society , <3>
Rowlands, H. , 1766 , Mona Antiqua Restaurata , <4>
Lynch, F. , 1970 , Prehistoric Anglesey , <6>
Grimes, W. F. , 1963 , The Stone Circles and Related Monuments in Wales , <5>
Thompson, D. , 1991 , PRN 3135 , <8>
Smith, G. , 2008 , Archaeology in Wales , <10>
Hopewell, D. & Smith, G. , 2007 , Prehistoric Funerary and Ritual Monument Survey: Assessments of Monuments at Risk in an Agricultural Landscape - Ceremonial Monuments , <11>

Events :
42707 : PRN 3135 Gat Site Visit (year : 1991)
40526 : Prehistoric Funerary and Ritual Monument Survey: West Gwynedd/Anglesey (year : 2003)
40522 : Prehistoric Funerary and Ritual Monument Survey: Assessments of Monuments at Risk in an Agricultural Landscape - Ceremonial Monuments (year : 2007)
40520 : Bryn Gwyn Stones, Brynsiencyn, Anglesey. Preliminary Report (year : 2008)
44072 : Bryn Gwyn Stones, Brynsiencyn, Anglesey. Excavation 2010 Preliminary Report (year : 2010)
44548 : Bodrida Wind Turbine, Brynsiencyn, Isle of Anglesey (year : 2013)
44662 : Proposed Wind Turbine at Tre Ifan, Brynsiencyn, Anglesey (year : 2012)
40527 : Pan-wales Prehistoric Funerary and Ritual Sites Survey: Trial Data Synthesis (year : 2005)

Related PRNs : 302402

Compiled date : 17-02-1987


Images :



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 2018 (and in part © Crown, 2018 - as indicated)
This information is supplied for the purposes of personal interest only and may not be used as part of a commercial project.

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