© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Grosmont Castle is a Norman fortification located in the Monmouth area of Monmouthshire, Wales, founded in the early twelfth century as part of the Anglo-Norman conquest and settlement of South Wales. The castle comprises a substantial stone keep built upon an earlier motte-and-bailey earthwork, with later medieval additions including curtain walls and domestic structures that reflect its development as a baronial stronghold throughout the medieval period. The site demonstrates the characteristic defensive architecture of its era, with the prominent stone keep serving as both a symbol of Norman authority and a practical military structure commanding the surrounding landscape. Grosmont remained strategically significant until the later medieval period, when it gradually declined as a residence and military installation.
Grosmont Castle is a scheduled monument protected by Cadw under reference MM007. View the official record →
Grosmont Castle is a Norman fortification located in the Monmouth area of Monmouthshire, Wales, founded in the early twelfth century as part of the Anglo-Norman conquest and settlement of South Wales. It is designated a Scheduled Ancient Monument by Cadw under reference MM007.
Grosmont Castle dates from the medieval period, and is classified as a castle. It is one of over 32,000 scheduled monuments protected across the UK.
Grosmont Castle 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 MM007.
Several scheduled monuments lie within 10 km, including Grosmont Churchyard Cross (0.2 km), Iron Age farmstead enclosure on Garway Hill (3.7 km), Churchyard cross in St Michael's churchyard (5.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Grosmont Castle'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.
Grosmont Castle stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.