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Bwlch Aeddan Dyke is a medieval linear earthwork in Wales, protected by Cadw under reference MG100. The monument consists of an artificially constructed bank and ditch system characteristic of medieval boundary defence works. Such linear earthworks typically marked territorial boundaries, controlled movement across landscape, or defended against cross-border raiding during periods of local conflict or administrative consolidation.
The dyke follows the natural terrain of its location, where bedrock of Wenlock age lies beneath the surface. These Undifferentiated Wenlock Rocks—composed of mudstone, siltstone and sandstone—would have presented both challenge and opportunity to its medieval builders. The softer geology allowed excavation of the ditch, whilst the upcast soil and underlying stone were heaped to form the defensive bank.
As a linear earthwork of medieval date, Bwlch Aeddan Dyke represents an investment in landscape control by a Welsh lord or community with the resources to organise substantial labour. The monument's survival into the present day, despite the weathering effects of centuries and agricultural use, demonstrates the scale of its original construction. Its protection reflects its significance as evidence of medieval Welsh settlement patterns and territorial organisation.
Bwlch Aeddan Dyke is a scheduled monument protected by Cadw under reference MG100. View the official record →
Bwlch Aeddan Dyke is a medieval linear earthwork in Wales, protected by Cadw under reference MG100.
Bwlch Aeddan Dyke dates from the medieval period, and is classified as a linear earthwork. It is one of over 32,000 scheduled monuments protected across the UK.
Bwlch Aeddan Dyke 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 MG100.
Several scheduled monuments lie within 10 km, including Mound in Churchyard (5 km), Powis Castle Park Mound (5.7 km), Camp 270m SSW of Ty Mawr (6.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Bwlch Aeddan Dyke'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.
Bwlch Aeddan Dyke stands on Wenlock Rocks (Undifferentiated), bedrock that formed in the Wenlock. The rock here is mudstone, siltstone and sandstone.