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Offa's Dyke is an early medieval linear earthwork extending 2143 metres south from The Firs at Rhos-y-Meirch in Wales. Built as a frontier defence and demarcation line, the dyke belongs to the tradition of monumental earthwork construction undertaken along the Anglo-Saxon and Welsh border. This particular section is constructed across the Ludlow Rocks, a bedrock formation of mudstone, siltstone and sandstone that determined the dyke's engineering and survival. The varying geology beneath the earthwork has influenced its preservation, with the firmer strata providing better support for the banks and ditch system characteristic of such linear fortifications.
The monument's survival as an upstanding earthwork owes much to the underlying solid geology, which has resisted erosion more effectively than softer deposits elsewhere. The passage of time has softened the profile of both bank and ditch, yet the linear form remains clearly traceable across the landscape, marking the historical division of territories. The specific topography around Rhos-y-Meirch, shaped by the Ludlow bedrock, would have influenced both the route selection and the effectiveness of the dyke as a barrier.
This section is statutorily protected by Cadw under reference RD019, recognising its archaeological and historical significance as part of the wider Offa's Dyke system. The monument preserves evidence of early medieval border management and territorial organisation in one of Britain's most important cultural frontiers.
Offa's Dyke: Section extending 2143m S from The Firs, Rhos-y-Meirch is a scheduled monument protected by Cadw under reference RD019. View the official record →
Offa's Dyke is an early medieval linear earthwork extending 2143 metres south from The Firs at Rhos-y-Meirch in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference RD019.
Offa's Dyke: Section extending 2143m S from The Firs, Rhos-y-Meirch 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 extending 2143m S from The Firs, Rhos-y-Meirch 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 RD019.
Several scheduled monuments lie within 10 km, including Churchyard cross in St Michael's churchyard (7.7 km), Womaston Castle Mound (7.7 km), Offa's Dyke: section S of Riddings Brook on Herrock Hill (7.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Offa's Dyke: Section extending 2143m S from The Firs, Rhos-y-Meirch'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 extending 2143m S from The Firs, Rhos-y-Meirch stands on Ludlow Rocks (Undifferentiated), bedrock that formed in the Ludlow. The rock here is mudstone, siltstone and sandstone.