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Twlc y Filliast Burial Chamber is a prehistoric chambered tomb located in Wales and protected by Cadw as a scheduled monument under reference CM055. The site lies on bedrock composed of Tremadoc Rocks, an undifferentiated sequence of mudstone, siltstone and sandstone formed during the Tremadocian period. These fine-grained sedimentary deposits, laid down over 480 million years ago, underlie the monument and would have influenced both its original construction and the stability of its stone structure through subsequent millennia.
Chambered tombs of this type were built during the Neolithic period, serving as communal burial places for early farming communities. The name Twlc y Filliast preserves Welsh-language references to the monument's form and function, reflecting centuries of local knowledge. The construction of such monuments required significant communal effort and demonstrates the social organisation and ritual practices of prehistoric Wales.
Today, the monument survives as a testament to early Welsh burial practices and Neolithic engineering. Its preservation within the Tremadoc bedrock landscape offers potential for understanding how prehistoric peoples adapted their building techniques to local geology, using stone resources available in their immediate environment to create structures intended to endure across generations.
Twlc y Filliast Burial Chamber is a scheduled monument protected by Cadw under reference CM055. View the official record →
Twlc y Filliast Burial Chamber is a prehistoric chambered tomb located in Wales and protected by Cadw as a scheduled monument under reference CM055.
Twlc y Filliast Burial Chamber dates from the prehistoric period, and is classified as a chambered tomb. It is one of over 32,000 scheduled monuments protected across the UK.
Twlc y Filliast Burial Chamber 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 CM055.
Several scheduled monuments lie within 10 km, including Maen Melyn Standing Stone (3.4 km), Yr Hen Gapel, Llanybri (3.6 km), Delacorse Uchaf Standing Stone (5.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Twlc y Filliast Burial Chamber'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.
Twlc y Filliast Burial Chamber stands on Tremadoc Rocks (Undifferentiated), bedrock that formed in the Tremadocian. The rock here is mudstone, siltstone and sandstone.