Llanthony is located in the Vale of Ewyas, a deep and long valley with glacial origins within the Black Mountains, Wales, seven miles north of Abergavenny and within the eastern section of the Brecon Beacons National Park.

[2] Llanthony Priory is situated here; it dates back to about 1100 when a Norman nobleman Walter de Lacy was inspired by an existing chapel to devote himself to solitary prayer and study.

It was raided regularly by the Welsh and was soon in decline; after Owain Glyndŵr's rebellion in the early 15th century, it seems to have become barely functioning.

[3][4] The Priory became one of the great medieval buildings in Wales, being built in a mixture of Norman and Gothic architectural styles.

It is a Grade I Listed building, being "an important medieval monastic ruin with high quality surviving detail.