West of St. Clether parish church is a holy well and associated chapel, said to be one of Cornwall's best preserved. The church and holy well are dedicated to Saint Cleder (or Clederus), one of the twenty-four children of Saint Brychan, a Welsh saint and King of Brycheiniog in the 5th century. This well is set inside a baptistery, but Coxe does not indicate what this well was purported to cure.
For further information, please read Haunted Britain by Antony D. Hippisley Coxe.