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Roman Fortlet 300m SW of Gallt yr Adar Fawr is a small Roman military installation situated in the upland terrain of Wales. The site occupies bedrock of Ashgill formation—mudstone, siltstone and sandstone deposits of Ordovician age—which would have presented both practical challenges and defensive advantages to its Roman builders. Fortlets of this type typically served as minor outposts or patrol bases along communication routes, supporting the broader Roman military infrastructure in Wales during the occupation period.
The exposed geology of the Ashgill rocks creates a naturally rugged landscape characteristic of this region, where such modest garrisons monitored movement and maintained supply lines through difficult country. The fortlet's strategic placement reflects Roman understanding of local terrain and the need for dispersed military control across the Welsh uplands. No significant structural remains are visible on the ground today, though the site retains archaeological potential.
The monument is protected by Cadw, the Welsh Historic Monuments service, under reference CM389. This designation recognises its importance as evidence of Roman military organisation and presence in Wales during the first and second centuries AD, contributing to our understanding of how Rome administered and defended this frontier region.
Roman Fortlet 300m SW of Gallt yr Adar Fawr is a scheduled monument protected by Cadw under reference CM389. View the official record →
Roman Fortlet 300m SW of Gallt yr Adar Fawr is a small Roman military installation situated in the upland terrain of Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CM389.
Roman Fortlet 300m SW of Gallt yr Adar Fawr dates from the roman period, and is classified as a fort. It is one of over 32,000 scheduled monuments protected across the UK.
Roman Fortlet 300m SW of Gallt yr Adar Fawr 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 CM389.
Several scheduled monuments lie within 10 km, including Llanwrda Castle Mound (2.4 km), Mynydd Llansadwrn ring cairn (2.8 km), Cwm-Bran Camp (3.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Roman Fortlet 300m SW of Gallt yr Adar Fawr'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.
Roman Fortlet 300m SW of Gallt yr Adar Fawr stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.