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Posty Defended Enclosure is a prehistoric defensive earthwork situated in Wales, protected by Cadw under reference PE559. The site occupies bedrock formed from Arenig Rocks of Arenigian age, a geology composed of mudstone, siltstone and sandstone that would have presented both advantages and constraints to its construction. This challenging substrate, typical of upland Welsh terrain, required considerable effort to excavate ditches or raise ramparts, suggesting the enclosure's builders invested significant labour in securing this position.
The enclosure represents a distinctive form of prehistoric fortification, strategically positioned within the Welsh landscape. Such defended enclosures served multiple purposes within Iron Age and earlier societies, functioning as territorial markers, livestock corrals, and strongholds offering protection from hostile forces or raiding parties. The site's preservation as a scheduled monument reflects its importance to understanding prehistoric settlement patterns and defensive strategies in Wales.
The Arenig bedrock beneath Posty would have influenced both the construction methods employed and the drainage characteristics of the site. The mudstone and siltstone components would have made waterlogging a potential concern in lower areas, whilst the sandstone layers offered firmer ground for occupation. This geological context provides insight into how prehistoric communities adapted their engineering to local conditions when establishing defended positions across the Welsh uplands.
Posty Defended Enclosure is a scheduled monument protected by Cadw under reference PE559. View the official record →
Posty Defended Enclosure is a prehistoric defensive earthwork situated in Wales, protected by Cadw under reference PE559.
Posty Defended Enclosure dates from the prehistoric period, and is classified as a enclosure - defensive. It is one of over 32,000 scheduled monuments protected across the UK.
Posty Defended Enclosure 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 PE559.
Several scheduled monuments lie within 10 km, including Bush Inn Camp (7.7 km), Blackpool Iron Furnace (8.8 km), Iron Age Hillslope Enclosure in Canaston Wood (9.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Posty Defended Enclosure'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.
Posty Defended Enclosure stands on Arenig Rocks (Undifferentiated), bedrock that formed in the Arenigian. The rock here is mudstone, siltstone and sandstone.