- Dervel the Mighty
Born a prince, the son of King Hywel Mawr; grandson of Hoel I Mawr the Great. Brother of Saint Tudwal. Brother of Saint Arthfael. Soldier whose skill was celebrated the bards of his day; he fought in the battle of Camlan in 537. A life at war caused him to turn to religion. Hermit and then monk at Llantwit, Wales. Abbot of Ynys Enlli. Missionary. A wooden statue of Derfel on horseback was a great treasure of the church at Llanderfel; it was used in the pyre that burned Blessed John Forest.
- 6 April 660 at Ynys Enlli, Bardsey, Wales of natural causes
- relics at Llanderfel, Merionethshire, Wales
- relics destroyed by order of Oliver Cromwell
- “Saint Derfel Gadarn“. CatholicSaints.Info. 11 June 2016. Web. 17 January 2017. <>