This monument is open and free to visit with no pre-booking required.
Check our opening times and facilities below; please act responsibly and be respectful of the local area during your visit.
Please adhere to Welsh Government social distancing guidelines and coronavirus restrictions at all times and do not attempt to access enclosed spaces.
Ruined castle with a regal history
It’s a surprise to find this ruin, tucked away as it is in a lane off Monmouth’s main shopping street. Strategically located at crossings of the River Wye and River Monnow, only a few fragments – ruins of the 12th-century Great Tower and 13th-century hall – remain of this once-important castle. It was founded in the 11th century by Norman lord William fitz Osbern, and by the mid-14th century was in the hands of Henry of Grosmont, who modified the tower with large decorated windows whose outline can still be seen in the east wall.
The most notable event in the tower’s history occurred on 16 September 1387, when King Henry V of Battle of Agincourt fame was born here, an occasion commemorated at Monmouth’s Agincourt Square.
Can be viewed externally