Ancient Monuments

History on the Ground

This site is entirely user-supported. See how you can help.

Bryn Eryr Rectangular Earthwork

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

We don't have any photos of this monument yet. Why don't you be the first to send us one?

Upload Photo »

Approximate Location Map
Large Map »

If Google Street View is available, the image is from the best available vantage point looking, if possible, towards the location of the monument. Where it is not available, the satellite view is shown instead.


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, located in low-lying fields and dating to the Iron Age and Romano-British period (c.800BC - AD400). It is a rectangular enclosure, its long axis NE-SW, now defined by a low bank, c.0.2 m high, with traces of an external ditch. Both are very slight as the result of ploughing. 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 enclosed area to the NW of the field boundary, some 66m by 47m, was excavated by Gwynedd Archaeological Trust between 1985 and 1987 identifying a sequence of occupation beginning in the Middle Iron Age. This first phase consisted of a single clay-walled round house within a timber stockade. By the later Iron Age, a second house had been added, adjacent to the first and both were enclosed by a bank and ditch. Rectangular post-built structures, possibly granaries, were built and pits dug to provide clay flooring and wall plastering. By the early 1st millennium AD, the perimeter ditch had become choked with silt. A third house was added at this time and the farm seems to have been abandoned some time during the late 3rd or 4th centuries.

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

Other nearby scheduled monuments is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact for any queries related to any individual ancient or schedued monument, planning permission related to scheduled monuments or the scheduling process itself. is a Good Stuff website.