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Castell Gronw Castle Mound is a medieval motte situated in Wales and protected by Cadw under reference ME067. The earthwork rises from bedrock composed of Caradoc Rocks—Ordovician mudstone, siltstone and sandstone deposited during the Caradocian period some 450 million years ago. This geology provided a firm foundation for the Norman colonisation of Wales, when such mottes served as the earliest and most practical form of fortified settlement. The mound itself represents the characteristic military architecture of the 11th to 13th centuries, when a simple but effective design of raised earthwork topped with timber palisade and keep dominated frontier territories. The durability of the underlying Caradoc strata ensured the motte's stability and longevity across centuries.
Castell Gronw Castle Mound is a scheduled monument protected by Cadw under reference ME067. View the official record →
Castell Gronw Castle Mound is a medieval motte situated in Wales and protected by Cadw under reference ME067.
Castell Gronw Castle Mound dates from the medieval period, and is classified as a motte. It is one of over 32,000 scheduled monuments protected across the UK.
Castell Gronw Castle Mound 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 ME067.
Several scheduled monuments lie within 10 km, including Tomen y Bala Castle Mound (1.1 km), Llanfor Roman Fort and Camps (revealed by Aerial Photography) (1.3 km), Pen-Ucha'r-Llan Ringwork (2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Gronw Castle Mound'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.
Castell Gronw Castle Mound stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.