Son of Arwystli Glof ab Seithenyn. Sixth-century monk on Bardsey Island, Wales. Built a church in the village of Lladyfrydog, Wales. A standing stone nearby is said to be a man who stole the bible from that church and got turned into stone.
- Book of Saints, by the Monks of Ramsgate
- Kirken i Norge
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint Tyfrydog“. Saints.SQPN.com. 31 December 2013. Web. 22 October 2014. <>