The castle was once owned by Edmund Crouchback, the first Earl of Lancaster and brother to King Edward I.
The hall block is one of the best-preserved 13th-century domestic buildings in any Welsh castle.
During the 13th century, the castle was upgraded to become a princely residence rather than just a military outpost.
The moat surrounding the site remains clearly visible, though it is now dry.
It served as a key administrative center for the lordship of the Three Castles for several centuries.
Grosmont Castle is a ruined 13th-century fortification located in the Monmouthshire borderlands between England and Wales. Originally built as an earthwork motte-and-bailey castle, it was rebuilt in stone by Hubert de Burgh in the early 1200s. The site features a distinctive triangular ward and a notable ruined gatehouse. Significant architectural remnants include a grand hall block with decorated windows and a large circular tower. It formed one of the Three Castles alongside Skenfrith and White Castle, which were historically administered as a defensive group. The site is now under the stewardship of Cadw, the Welsh historic monuments agency. Visitors can access the grounds to explore the remnants of the stone curtain walls and the moat. The castle fell into decline by the 16th century after losing its military importance.
The view from the base of the moat looking up at the high-arched windows of the great hall.
Wear sturdy, waterproof footwear as the ground can be uneven and muddy.
Bring a picnic to enjoy on the grass, as there are no on-site cafes.
Explore the adjacent village of Grosmont, which contains historic timber-framed houses.
Do not attempt to park in the narrow village lanes; use designated nearby parking areas.
Do not climb on the loose masonry or historical walls.
