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Offa's Dyke: Section from Cwm By-Road to Hem Road is an early medieval linear earthwork that forms part of the extensive frontier work built between England and Wales. This section of the dyke crosses terrain underlain by Caradoc Rocks, a Caradocian-age bedrock of mudstone, siltstone and sandstone that shaped the earthwork's construction and long-term stability. The monument is protected by Cadw under reference MG037.
The dyke in this locality follows the natural topography of the Welsh landscape, its course determined partly by the underlying geology and existing settlement patterns. Built as a territorial boundary, the earthwork consists of a substantial bank with accompanying ditch, engineered to demarcate political control across the borderland. The Caradoc Rocks' alternating layers of softer and harder stone would have influenced both construction techniques and the ditch's drainage properties over the centuries.
This section of Offa's Dyke represents a surviving fragment of what was once a major engineering achievement stretching over 150 miles. Its preservation here, between Cwm By-Road and Hem Road, provides evidence of early medieval land management and the physical assertion of power across the Welsh border during the early medieval period. The monument remains significant for understanding frontier dynamics in early medieval Britain.
Offa's Dyke: Section from Cwm By-Road to Hem Road is a scheduled monument protected by Cadw under reference MG037. View the official record →
Offa's Dyke: Section from Cwm By-Road to Hem Road is an early medieval linear earthwork that forms part of the extensive frontier work built between England and Wales. It is designated a Scheduled Ancient Monument by Cadw under reference MG037.
Offa's Dyke: Section from Cwm By-Road to Hem Road 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: Section from Cwm By-Road to Hem Road 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 MG037.
Several scheduled monuments lie within 10 km, including Offa's Dyke: Section from Dudston Covert, Lymore to Lack Brook, Churchstoke (6.1 km), Offa's Dyke: section NW of Ditches Farm Also in Powys: Wales (6.4 km), Three Roman camps NW of Brompton Mill including tumulus and section of Offa's Dyke (7.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Offa's Dyke: Section from Cwm By-Road to Hem Road'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: Section from Cwm By-Road to Hem Road stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.