Ancient Monuments

History on the Ground

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

Hendrefor 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: 53.2655 / 53°15'55"N

Longitude: -4.1825 / 4°10'56"W

OS Eastings: 254535

OS Northings: 376501

OS Grid: SH545765

Mapcode National: GBR JN12.8WP

Mapcode Global: WH540.Q5JX

Entry Name: Hendrefor Earthwork

Scheduled Date:

Source: Cadw

Source ID: 3271

Cadw Legacy ID: AN075

Schedule Class: Monument

Category: Enclosure

Period: Roman

County: Isle of Anglesey (Ynys Môn)

Community: Cwm Cadnant

Traditional County: Anglesey


A rectangular enclosure surrounded by a ditch between two banks, possibly dating to the Iron Age or Romano-British period (c.800BC to AD400). It is situated in a low-lying marshy field. The outer bank is clearly visible on the corners, but tends to disappear between. The inner bank has survived to a height of 0.1 m along its length, and higher at the corners; it is 3 - 4 m wide. There is an 8 m wide gap in the banks on the NE side which probably represents the entrance. The interior measures 50 m by 40 m where a low, near-circular mound roughly 10m across may represent a roundhouse site.

The monument is of national importance for its potential to enhance our knowledge of Iron Age or Romano-British defence and settlement. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structure itself 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.