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Offa's Dyke: North Section at Coedpoeth is an early medieval linear earthwork constructed during the 8th century as a frontier monument between the Anglo-Saxon kingdom of Mercia and the Welsh principalities. The dyke runs as an earthen bank through the Welsh landscape, forming part of the most substantial monument of the Anglo-Saxon period in Britain. This northern stretch crosses bedrock of the Pennine Middle Coal Measures Formation, comprising mudstone, siltstone and sandstone interspersed with coal seams and iron-rich deposits that would have shaped the dyke's construction and preservation.
The monument's survival at Coedpoeth reflects both its original substantial engineering and the protective qualities of the underlying geology. The ferricrete bands within the Coal Measures bedrock have created hardened surfaces that help stabilise the earthwork against erosion. The landscape here, marked by industrial heritage from later coal extraction, lies within the broader upland terrain that characterised the disputed border zone.
The site is protected by Cadw, the Welsh heritage authority, under the reference DE182, ensuring its preservation as a crucial record of early medieval territorial control and engineering ambition. The dyke remains a fundamental document in understanding Anglo-Saxon frontier policy and construction methods during one of Britain's formative periods.
Offa's Dyke: North Section at Coedpoeth is a scheduled monument protected by Cadw under reference DE182. View the official record →
Offa's Dyke: North Section at Coedpoeth is an early medieval linear earthwork constructed during the 8th century as a frontier monument between the Anglo-Saxon kingdom of Mercia and the Welsh principalities. It is designated a Scheduled Ancient Monument by Cadw under reference DE182.
Offa's Dyke: North Section at Coedpoeth dates from the early medieval period, and is classified as a linear earthwork. It is one of over 32,000 scheduled monuments protected across the UK.
Offa's Dyke: North Section at Coedpoeth is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is DE182.
Several scheduled monuments lie within 10 km, including Gardden Camp (6.6 km), Offa's Dyke: Y Gardden Camp Section (6.9 km), Wat's Dyke: Section extending from Black Brook Bridge to Pentre-Clawdd (6.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Offa's Dyke: North Section at Coedpoeth's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Offa's Dyke: North Section at Coedpoeth stands on Pennine Middle Coal Measures Formation And South Wales Middle Coal Measures Formation (Undifferentiated), bedrock that formed in the Moscovian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.