Llanthomas Castle Mound

Llanthomas Castle Mound stands on a low earthwork near Hay-on-Wye in Powys. It is the remains of a motte-and-bailey castle built by the Normans soon after their invasion of Wales in the late 11th century. The mound rises only a few metres above the surrounding ground, showing the modest scale of early Norman fortifications. A deep ditch once surrounded the bailey, and the motte’s summit would have carried a wooden keep. The builders used local earth and timber, digging the ditch to provide both defence and building materials. Cadw, the Welsh body that protects historic sites, recognises the mound as an important example of medieval military architecture. It may help scholars understand how early Norman lords defended their new territories in Wales. The scheduled area includes the motte and a broad lawn at its base, where traces of the bailey’s buried walls survive. Antiquarian records link the castle to a nearby ford across the River Wye, showing its role in controlling a key crossing. Visitors today see a grassy mound with an uneven top, hinting at buried stonework from a later keep. The ditch is still visible on the north side, running down to Digeddi Brook. A hawthorn tree grows on the summit, one of the few signs of life above ground. The surrounding lane follows the line of the old bailey, and the brook provided water for the garrison’s kitchens and stables. The peaceful field where sheep once grazed is now divided into homes, but the earthworks remain to tell the story of Norman power in the Welsh Marches.