A cairn on the top of the Llanberis Pass in Wales is known as Corffwysfa Pens (the Resting-Place of Saint Pens), and there are traditions of pilgrimage to the hill to pray for the intercession of Saint Pens. However, no information about him has survived.
- Book of Saints, by the Monks of Ramsgate
- Catholic Online
- Our Sunday Visitor’s Encyclopedia of Saints
- Three Saints, Two Wells and a Welsh Parish, by Tristan Gray Hulse