Ancient Monuments

History on the Ground

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Offa's Dyke: Section extending 1960m from Yew Tree Farm to Quarries north east of Granner Wood

A Scheduled Monument in Whitton (Llanddewi yn Hwytyn), Powys

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Latitude: 52.2695 / 52°16'10"N

Longitude: -3.0704 / 3°4'13"W

OS Eastings: 327055

OS Northings: 264017

OS Grid: SO270640

Mapcode National: GBR B3.Z2RW

Mapcode Global: VH771.Q7P2

Entry Name: Offa's Dyke: Section extending 1960m from Yew Tree Farm to Quarries NE of Granner Wood

Scheduled Date:

Source: Cadw

Source ID: 1912

Cadw Legacy ID: RD022

Schedule Class: Monument

Category: Linear earthwork

Period: Early Medieval

County: Powys

Community: Whitton (Llanddewi yn Hwytyn)

Traditional County: Radnorshire


The monument consists of a linear earthwork, a substantial bank and ditch forming a major boundary between two adjacent landholdings. Most date from the late Bronze Age and Iron Age. Offa's Dyke, however, is known to date to the later 1st century AD. It runs roughly along the border between modern England and Wales. It is traditionally thought to have been built by the Mercian King Offa in the later 8th century, but recent excavations on a section near Chirk suggest that work may have begun at least two centuries earlier than this. The remains included in this stretch consist, to the north of SO 2697 6439, of a substantial bank, reaching up to c.3m high on its eastern side and standing c.5-6m above the base of a western ditch, which is up to 3m deep below the ground surface on the west. At points in this northern section, there are traces of an additional counterscarp bank outside the western lip of the ditch. To the south of SO 2697 6439, with the exception of the portion in the Hilltop Plantation area around SO 2713 6352, which is again fairly substantial, the remains are still clear but on a lesser scale. They stand generally up to c.1m high, overlain for much of the length by later boundaries, with occasional slight traces of the ditch.

The monument is of national importance for its potential to enhance our knowledge of early medieval defensive organisation and settlement. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The remains form part of the record of the line of the earthwork, and their importance is further enhanced by their group value.

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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