Tyfrydog

Tyfrydog (sometimes given as Tyvrydog) Some of his siblings are also venerated as saints. Twrnog is commemorated at the church in Llandyrnog, Denbighshire, in north-east Wales, while his brother Tudur (or Tudyr) was recorded as a saint from Darowen, Powys, in west Wales. His sister, Marchell, is reported to have established Ystrad Marchell, near Welshpool in mid-Wales, where an abbey (Strata Marcella) was later built. Llandyfrydog takes its name from the church and the saint: the Welsh word originally meant "enclosure" and then "church", and "-dyfrydog" is a modified form of his name.

He is venerated as a saint, although he was never canonized by a pope: as the historian Jane Cartwright notes, "In Wales sanctity was locally conferred and none of the medieval Welsh saints appears to have been canonized by the Roman Catholic Church". The feast day of St Tyfrydog is 1 January. It is also said that the man's soul is periodically chased around the field during the night, chased by "demons with red-hot pitchforks."