Erfyl

Saint Erfyl (also called Eurfyl or Gwerfyl) was a Welsh virgin. She is held to have founded the church of Llanerfyl in Powys, where her grave is thought to be.

Records of her feast first appear in Wales in the fifteenth century, on 6 July. The church holds a reliquary of Erfyl, and in its grounds are the remains of a wooden shrine and a yew tree which, according to tradition, grew from the saint's staff. A well named for her once stood a short way from the church; its water was held to heal and was used in baptism. She has been called the daughter of Padarn and a cousin of Cadfan, but this comes from a misreading of an inscribed stone in the churchyard.

She is commemorated on 5 July as a saint of the undivided Church, by the New Calendar.