Gwynedd Archaeological Trust
Regional Historic Environment Record

Y Werthyr Hillfort, Bryngwran

Primary Reference Number (PRN) : 3505
Trust : Gwynedd
Community : Bryngwran
Unitary authority : Ynys Mon
NGR : SH37457820
Site Type (preferred type first) : Prehistoric HILLFORT
Status : Scheduled Ancient Monument

Description :
Y Werthyr, hillfort, crowning a low knoll above marshes around Afon Caradog, 1 1/2m N of the parish church, almost isolated by marsh except on the S. Defences consist of two, and on the NE three, concentric lines of ramparts enclosing area 200 by 220yds. Ramparts denuded by ploughing and now fragmentary and difficult to follow. On the W the outer rampart is a terrace with retaining wall probably the original rampart facing. Entrance may have been where this terrace incurves towards the road which now cuts through the fort from NW to SE. Centre of area is irregular, but no definite foundations can be traced. (RCAHMW, 1937)

Hill fort, site of. <2>

Rescue excavations revealed that on the N side of the site at least, the traces of defensive earthworks appear to be entirely natural features. Excavations within the area failed to reveal any trace of contained structures. Only find from site was an unstratified bronze-iron terret of 'Don' type. <3>

Discovery of a 'Don' terret. <6>

Not visited (Smith, 2005)

This double-ringwork at Bryngwran was a focus for rescue excavations in the 1960s and 1970s (Livens 1965; 1976). The northern side of the enclosure, including the ramparts, was examined but the excavations failed to reveal any evidence for internal structures. The only find from the site was an unstratified bronze-iron harness ring (terret) which dates to the second or third century AD (Lynch 1991, 232).

A recent geophysical survey by Gwynedd Archaeological Trust confirmed the presence of an oval bivallate enclosure, with external dimensions c. 150m by 200m (Smith and Hopewell 2007). The survey identified the presence of two ditches, 5m wide, and the parallel ramparts are still visible on the surface. A line of small anomalies along the centre of the inner ditch were interpreted as a timber palisade, while parallel anomalies in the north-eastern and eastern banks were interpreted as indicating the presence of a box rampart (Smith and Hopewell 2007). It is also possible that they represent an earlier timber palisade, as demonstrated at Castell Odo. The interior of the enclosure produced little evidence for occupation, although a scatter of anomalies along the inside of the eastern ramparts could indicate hearths and roundhouses. A second rectangular-shaped enclosure is visible within the hillfort on the west, with an entrance facing north. This may belong to the later phase of occupation during the Romano-British period, as the terret find implies. (Waddington, 2013)

Sources :
Cooke, N. , 2014 , Rhyd-y-Groes Repower, Anglesey: Cultural Heritage Assessment. ( © Wessex Archaeology)
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)
Smith, G. & Hopewell, D. , 2007 , Survey of Prehistoric Defended Enclosures in North West Wales: Assessment of Some Possibly Early Multivallate Enclosures in Llyn and Anglesey 2006-2007 ( © 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
Livens, R. G. , 1976 , Welsh Antiquity , <6>
Ordnance Survey , 1963 , SH37NE 6 , <2>
Livens, R. G. , 1965 , Archaeology in Wales , <3>
Royal Air Force , 1945 , 1066-UK655-3184-5.13.8.45 , <4>
Hopewell, D. & Smith, G. , 2006 , Archaeology in Wales , <14>
Driver, T. , 2005 , PRN 3505 , <15>

Events :
42846 : Y Werthyr (year : 1965)
40621 : Prehistoric Defended Enclosures in North-west Wales, 2004-5: West Conwy, Gwynedd (Arfon) and Anglesey (year : 2005)
44557 : Early Celtic Societies in North Wales (year : 2010)
44676 : Survey of Prehistoric Defended Enclosures in North-west Wales: Possible Early Multivallate Enclosures in Llyn and Anglesey 2006-7 (year : 2007)
45013 : Rhyd-y-Groes Repower, Anglesey: Cultural Heritage Assessment. (year : 2014)
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 : 95549

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.

November 19, 2018, 9:09 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