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Grosmont Castle

Grosmont Castle by Robert Cutts

Grosmont Castle is a ruined medieval castle located in the village of Grosmont, Monmouthshire, Wales. It is situated in the beautiful landscape of the Monnow Valley, near the border with England. The castle is a Grade I listed building and a scheduled monument, recognized for its historical significance.

Construction of Grosmont Castle began in the late 12th century, around 1219, under the orders of Hubert de Burgh, Earl of Kent and the Chief Justiciar of England. The castle was strategically positioned to control the important route through the Monnow Valley and to protect the border between England and Wales.

Grosmont Castle is a typical example of a Welsh border fortress. It was built using local red sandstone and features a curtain wall with round towers, a central keep, and a gatehouse. The castle was designed to withstand sieges and attacks, with thick walls and defensive features such as arrow loops and battlements.

The castle saw various periods of conflict and changed hands multiple times during its history. It played a role in the conflicts between the Welsh and the English, as well as the struggles between rival English nobles. In the 14th century, Grosmont Castle was briefly held by Owain Glyndŵr, the Welsh rebel leader.

Over time, the castle’s military importance declined, and by the 16th century, it fell into disrepair. It was no longer a functional stronghold and was abandoned. The castle ruins that remain today provide glimpses into its former grandeur and architectural features.

Despite its ruined state, Grosmont Castle continues to attract visitors who are drawn to its historical significance and picturesque location. The castle is managed by Cadw, the historic environment service of the Welsh Government, and it is open to the public. Visitors can explore the castle’s remains, including the keep, towers, and parts of the curtain wall, which offer insights into its medieval architecture and defensive features.

Grosmont Castle, along with the nearby town of Grosmont and its surrounding countryside, provides a captivating glimpse into the medieval history and heritage of the Welsh Marches. Its location amidst the scenic landscape adds to its allure, making it a fascinating destination for history enthusiasts and those interested in exploring Wales’ rich past.

Image shows Grosmont Castle from the South-East, looking at the remains of the 13th-century gatehouse. Photo by Robert Cutts from Bristol, England, UK  [CC BY 2.0], via Wikimedia Commons.


Abergavenny. NP7 8EP

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Opening hours

  • Monday
    10:00 am - 4:00 pm
  • Tuesday
    10:00 am - 4:00 pm
  • Wednesday
    10:00 am - 4:00 pm
  • Thursday
    10:00 am - 4:00 pm
  • Friday
    10:00 am - 4:00 pm
  • Saturday
    10:00 am - 4:00 pm
  • Sunday
    10:00 am - 4:00 pm

These are the peak summer opening times.
Other times may vary. For full details please visit the CADW website.
Last admission 30 minutes before closing.
Closed 24th, 25th, 26th December and 1st January.

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