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Pen-plaenau Roman marching camp is a Roman temporary encampment situated in Wales on bedrock formed from Caradocian mudstone, siltstone and sandstone. Constructed during Rome's military campaigns in Britain, the camp represents the logistical infrastructure that supported legionary operations across difficult terrain. Its location on the Caradoc Rocks geology reflects the strategic placement of such temporary bases, built to house soldiers during marching seasons or specific campaigns. The underlying solid rock would have presented both challenges and advantages for construction and drainage of the encampment.
The site preserves evidence of the distinctive rectangular plan characteristic of Roman temporary camps, with defensive earthworks and ditches arranged in a standardised military layout. These camps were typically occupied for only brief periods, abandoned once their purpose was fulfilled, unlike the more permanent fort installations built in Roman Britain. The Pen-plaenau example demonstrates how Rome's military engineering extended across Wales, even in areas of challenging topography.
The monument is protected by Cadw, the heritage body of the Welsh Government, under the reference DE296, ensuring its preservation and continued study. Archaeological work on such sites contributes to understanding Roman military strategy and the scale of occupation across the Welsh landscape during the imperial period.
Pen-plaenau Roman marching camp is a scheduled monument protected by Cadw under reference DE296. View the official record →
Pen-plaenau Roman marching camp is a Roman temporary encampment situated in Wales on bedrock formed from Caradocian mudstone, siltstone and sandstone. It is designated a Scheduled Ancient Monument by Cadw under reference DE296.
Pen-plaenau Roman marching camp dates from the roman period, and is classified as a marching camp. It is one of over 32,000 scheduled monuments protected across the UK.
Pen-plaenau Roman marching camp 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 DE296.
Several scheduled monuments lie within 10 km, including Y Foel Ddu Round Barrow (4.7 km), Craig Berwyn Round Barrow (5.6 km), Y Garnedd Wen Round Cairn (5.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen-plaenau Roman marching camp'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.
Pen-plaenau Roman marching camp stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.