Remains of mediæval preaching cross
Henllys is an ancient parish in Monmouthshire, the northern part of which has become a suburb of the new town of Cwmbran. It has a population of 2,698. The name means 'ancient court' with hen 'ancient' and llys 'court'. The name may refer to the former administrative court of the lordship of Machen.
The parish church, dedicated to St Peter, is located in the rural south of the parish, a mile and a half from the built-up area of Cwmbran and a full two and a quarter miles from the village hall.