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Latitude: 53.2758 / 53°16'32"N
Longitude: -4.4392 / 4°26'21"W
OS Eastings: 237452
OS Northings: 378199
OS Grid: SH374781
Mapcode National: GBR HND1.K8V
Mapcode Global: WH42K.SX8L
Entry Name: Y Werthyr Hillfort
Source ID: 3258
Cadw Legacy ID: AN042
Schedule Class: Defence
County: Isle of Anglesey (Ynys Môn)
A hillfort crowning a low knoll above the marshes around the Afon Caradog. The site is almost isolated by marsh, except on the S. The defences consist of two, and on the NE three, concentric lines of ramparts enclosing an area 180m by 200m. The ramparts are very fragmentary, being denuded by ploughing. On the W the line of the outer rampart is represented by a terrace with a retaining wall which may represent the original rampart facing. The entrance may have been where this terrace incurves towards the road which now cuts through the fort from NW to SE. In the centre of the area the ground is irregular.
A new road now cuts through the west part of the site. In the field to the E of the road it is possible to see an outer bank on the NW and NE, with the modern field wall curving round with the bank. It is also possible to see this bank on the SE side, but it is not visible on the E. The inner bank is most clearly visible on the NW side, and can also be seen on the W side.
The old disused road seems to lie between the inner and outer banks, and is 1.0 m below the surrounding ground surface. Twelve metres W of the road, and presumably forming the outer rampart, is a terrace 1 - 1.5 m high which curves in abruptly at the N end, forming the possible entrance.
The site was excavated in 1965 by R G Livens. A 'Don Terret' was found amongst the boulders on the NW side, but of the site the excavator said: 'The limited excavations produced no evidence of defensive banks, or, more significantly, ditches.' The excavations have never been fully published, but the conclusion drawn is not supported by the physical remains on the site.
The monument is of national importance for its potential to enhance our knowledge of Prehistoric settlement and defence. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structures themselves may be expected to contain archaeological information concerning chronology and building techniques.
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