The castle was probably built by Sir Ralph Monthermer in the second half of the 13th century, or a little earlier by FitzPayn. At the end of the fourteenth century it passed into the hands of the Montacutes family. After the execution of Margaret, wife of Sir Richard Pole in 1541, it was taken over by the Crown, and then sold to Edward Woodward in 1610. He in turn sold it to Rhys Kemeys. It is not known when the castle was abandoned and fell into disrepair.
The castle was erected on a quadrilateral plan with two corner, cylindrical towers in the southern curtain. The south-east tower was at least 14 meters high and 3 meters in internal diameter. It had at least three floors and an entrance from the ground and first floors, probably to the adjacent wa;;-walk on the defensive walls. A dozen or so meters west of the south-west corner was another tower, not connected with the perimeter of the defensive walls. Its small height of about 3 meters indicates that it could have been a dovecote.
To the present day, three cylindrical towers, fragments of a defensive wall preserved up to a height of 4 meters and relics of buildings from the Tudor period have survived. The whole is overgrown with vegetation and difficult to access due to its location on private property.
Salter M., The castles of Gwent, Glamorgan & Gower, Malvern 2002.
Website gatehouse-gazetteer.info, Llanfair Discoed Castle.