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Mynydd Maendy Hillfort is a prehistoric fortified settlement perched on the coalfield plateau of South Wales. The site commands the local landscape where bedrock of the South Wales Upper Coal Measures Formation—comprising mudstone, siltstone and sandstone interspersed with coal seams and bands of ironstone—rises beneath shallow soils. This geology, formed during the Westphalian period, provided both defensive advantage through elevation and hard stone useful for construction and tool-making to Iron Age communities who occupied the hilltop.
The hillfort's defences comprise ramparts and ditches typical of later prehistoric fortification in Wales, enclosing a settlement area utilised for domestic occupation and storage. Such hillforts served multiple functions: they provided secure refuge, enabled control of surrounding territory, and offered a focal point for local communities during the Iron Age period when hillforts became characteristic features of the Welsh uplands.
The monument is protected and recorded by Cadw, the Welsh Historic Monuments service, under reference GM099, recognising its archaeological and historical significance as evidence of Iron Age settlement patterns and social organisation in the South Wales coalfield region.
Mynydd Maendy Hillfort is a scheduled monument protected by Cadw under reference GM099. View the official record →
Mynydd Maendy Hillfort is a prehistoric fortified settlement perched on the coalfield plateau of South Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM099.
Mynydd Maendy Hillfort dates from the prehistoric period, and is classified as a hillfort. It is one of over 32,000 scheduled monuments protected across the UK.
Mynydd Maendy Hillfort 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 GM099.
Several scheduled monuments lie within 10 km, including Mynydd Ton Cairns (1.8 km), Bwlch y Clawdd Dyke (2 km), Mynydd y Gelli kerb cairn (2.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Mynydd Maendy Hillfort'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.
Mynydd Maendy Hillfort stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.