An authoritative local history[REF] suggests that the settlement originates from a time when the St. Pierre Pill, an inlet off the Severn Estuary, was larger and much more important than now, and met an ancient ridgeway which passed through Shirenewton towards Monmouth.
Mathern was originally known as Merthyr-Tewdrig ("burial-place of Tewdrig"), after the martyrdom of St. Tewdrig, king of Gwent and Glywysing.