These impressive Medieval ruins of an Augustine priory are in the Vale of Ewyas in the village of Llanthony and date from the early 12th Century.

The site is open at any reasonable time and entry is free at the time of writing and there is a free car park.

Llanthony itself is just over the border into Monmouthshire although Capel-y-ffin, further up the valley is in Brecknockshire.

The name Llanthony is derived from Llandewi Nant Honddu - "the church of St David on the Honddu brook". The river that runs through the Vale of Ewyas is the River Honddu.

The Abbey Hotel, seen through the arches, was hewn out of a remaining part of the priory in the 18th century, and is still open as a pub/hotel.

In the 12th century Llanthony priory flourished and aquired many lands. They also had the right to take fish from Llangorse Lake and the path known as Rhiw Pyscod developed. Another path, Rhiw Cwrw, was made to bring the monks' beer from Abbeydore.

Attacks on the primarily English community by local people forced the monks to retreat to Hereford and Gloucester. The original buildings were destroyed.

The priory was re-established in the 13th century and the Priory Church rebuilt in magnificent style. The remains now visible date from this time. The beautiful window arches that survive are clues to the grandeur and importance of this site at the time.

The site is now in the guardianship of Cadw.