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Llanthony Priory is a partly ruined former Augustinian priory in the secluded Vale of Ewyas, a steep sided valley within the Black Mountains area of the Brecon Beacons National Park in Monmouthshire, south east Wales. It lies seven miles north of Abergavenny on an old road to Hay on Wye at Llanthony. The ruins date to 1100, and it is said Walter de Lacy discovered the ruins of the St David Chapel, where they built a new church dedicated to St John the Baptist, consecrated in 1108.
The monks of Llanthony Priory were constantly attacked by the local Welsh, moving to Llanthony Secunda Priory in Gloucester, England, built for them by Miles FitzWalter in 1136. The priory was rebuilt by Hugh de Lacy between 1186 and 1217, becoming one of the greatest medieval buildings in Wales; a mixture of Norman and Gothic architecture. In 1481, the priory had been abandoned and was formally merged with its sister site in Gloucester, and both sites were dissolved in 1538.