Ancient Monuments

History on the Ground

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Llyn Gwyn Earthwork

A Scheduled Monument in Nantmel, Powys

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Latitude: 52.2747 / 52°16'28"N

Longitude: -3.4486 / 3°26'54"W

OS Eastings: 301258

OS Northings: 265050

OS Grid: SO012650

Mapcode National: GBR 9L.YZHR

Mapcode Global: VH69D.53Q1

Entry Name: Llyn Gwyn Earthwork

Scheduled Date:

Source: Cadw

Source ID: 1937

Cadw Legacy ID: RD079

Schedule Class: Monument

Category: Earthwork (unclassified)

Period: Unknown

County: Powys

Community: Nantmel

Traditional County: Radnorshire


The Llyn Gwyn Earthwork consists of a crescent-shaped bank with an outer V-shaped ditch, enclosing an area of c.50m by c.24m. The scarp along the otherwise open south-west side probably represents the original bank of the lake, which is somewhat smaller today, and the ditch may have been water-filled. The remains are not especially diagnostic as to date, though they are traditionally associated with Strata Florida Abbey.

The monument is of national importance for its potential to enhance our knowledge of defensive, agricultural or settlement organisation. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits.

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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