Ancient Monuments

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Bryn Eryr Rectangular Earthwork

A Scheduled Monument in Cwm Cadnant, Isle of Anglesey (Ynys Môn)

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Latitude: 53.2578 / 53°15'28"N

Longitude: -4.1892 / 4°11'21"W

OS Eastings: 254059

OS Northings: 375663

OS Grid: SH540756

Mapcode National: GBR JN02.ZRQ

Mapcode Global: WH540.MCBT

Entry Name: Bryn Eryr Rectangular Earthwork

Scheduled Date:

Source: Cadw

Source ID: 3280

Cadw Legacy ID: AN100

Schedule Class: Monument

Category: Enclosure

Period: Roman

County: Isle of Anglesey (Ynys Môn)

Community: Cwm Cadnant

Traditional County: Anglesey


The monument comprises the remains of an enclosed settlement, dating to the Iron Age and Romano-British period (c.800BC - AD400). A rectangular enclosure defined by a low bank, c.0.2 m high, and an external ditch. Both are very slight as the result of ploughing. The site measures 61 m by 44 m internally, its long axis NE-SW. A modern field boundary crosses the site from the NE to the SW, dividing it into two unequal parts, the larger to the NW.

The monument is of national importance for its potential to enhance our knowledge of Iron Age and Romano-British 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.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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