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Porth Mawr is a post-medieval gatehouse in Breconshire, Wales, designated as a scheduled ancient monument under the reference Cadw SAM BR114. The structure dates from the post-medieval period and serves as a notable example of domestic gatehouse architecture characteristic of the region during this era. As a gatehouse rather than a standalone fortification, it would have functioned as a controlled entrance point to an associated estate or property, reflecting the status and security concerns of its proprietor. The monument represents the architectural traditions and domestic arrangements typical of post-medieval Wales, when such structures served both practical and symbolic purposes in establishing territorial boundaries and controlling access to holdings.
Porth Mawr is a scheduled monument protected by Cadw under reference BR114. View the official record →
Porth Mawr is a post-medieval gatehouse in Breconshire, Wales, designated as a scheduled ancient monument under the reference Cadw SAM BR114.
Porth Mawr dates from the post medieval/modern period, and is classified as a gatehouse. It is one of over 32,000 scheduled monuments protected across the UK.
Porth Mawr 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 BR114.
Several scheduled monuments lie within 10 km, including Coal and Iron Ore Workings West of Abergavenny Road, Blaenavon (9 km), Brake Engine on Hill Pits Tramroad Incline (9 km), Pwll Du Tunnel (9.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Porth Mawr'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.
Porth Mawr stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is sandstone and conglomerate, interbedded.