Gwynedd Archaeological Trust
Regional Historic Environment Record

Caer Idris Hillfort, Brynsiencyn

Primary Reference Number (PRN) : 1561
Trust : Gwynedd
Community : Llanidan
Unitary authority : Ynys Mon
NGR : SH49456797
Site Type (preferred type first) : Roman HILLFORT
Status : Scheduled Ancient Monument

Description :
A small hillfort on the edge of a small precipice. Three stony banks formerly terminating at the cliff edge are now cut off by a modern road on the north and walls to the E and W. Containing semicircular area c.260 x 114ft. The banks represent collapsed walls: small section of a fourth bank exists on the east. Three in situ facing stones near the entrance on third bank survive. Entrance itself is zigzagged. (RCAHMW, 1937)

Outer banks considerably denuded. <2> (1967)

Condition unchanged 1970. <3>

Scrub growth and smaller trees removed by NACRO scheme April 1986, contour survey of the site prepared. <4>

Not visited. (Smith, 2005)

A hillfort defined by three or more banks representing tumbled stone walls. It occupies the summit of a north-east to south-west ridge and backs up against the lip of the long cliff that forms the ridge's northern edge. The ruined walls enclose an elongated area some 80m by 36m. There is a single entrance in the long south-eastern facade, to which the outer walls allow only a staggered approach. A road, the A4080, running along the summit of the cliff line has obscured part of the fort. (Cooke, 2013)

Sources :
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)
Smith, G. , 2003 , Prehistoric Defended Enclosures: Scoping for Pan-Wales Assessment ( © GAT)
Smith, G. , 2005 , A Survey of Prehistoric Defended Enclosures in North West Wales 2004-2005: West Conwy, Gwynedd (Arfon) & Anglesey ( © GAT)
Smith, G. , 2008 , Iron Age Settlements in Wales: Cadw Defended Enclosures Publication Hillforts and Hut Groups in North-West Wales ( © GAT)
The Royal Commission on the Ancient and Historical Monuments of Wales , 1937 , An Inventory of the Ancient Monuments in Anglesey
Waddington, K. , 2010 , Early Celtic Societies in North Wales
Waddington, K. , 2013 , The Settlements of Northwest Wales: From the Late Bronze Age to the Early Medieval Period
Ordnance Survey , 1967 , SH46NE 16 , <2>
Ordnance Survey , 1970 , SH46NE 16 , <3>
Thompson, D. , 1986 , PRN 1561 , <4>

Events :
42057 : Prn 1561 Gat Site Visit (year : 1986)
40621 : Prehistoric Defended Enclosures in North-west Wales, 2004-5: West Conwy, Gwynedd (Arfon) and Anglesey (year : 2005)
44548 : Bodrida Wind Turbine, Brynsiencyn, Isle of Anglesey (year : 2013)
44557 : Early Celtic Societies in North Wales (year : 2010)
44662 : Proposed Wind Turbine at Tre Ifan, Brynsiencyn, Anglesey (year : 2012)
45042 : Iron Age Settlements in Wales: Cadw Defended Enclosures Publication. Hillforts and Hut Groups in North-West Wales. (year : 2008)
40620 : Prehistoric Defended Enclosures: Scoping for Pan-Wales Assessment (year : 2003)

Related PRNs : 58125

Compiled date :


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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