His father was Fragan, a prince of Dumnonia, and his mother Gwen Teirbron. The young family had fled to Brittany to avoid the plague raging in Cornwall at that time, and so grew up in Ploufragan near Saint-Brieuc with his brothers, Winwaloe and Wethenoc and a sister, Creirwy. He was educated by Budoc of Dol on the Île Lavret near Paimpol, and as an adult he founded churches in Brittany.
- "Celtic and Old English Saints - 6 February".
- Brian Daniel Starr, The Life of Saint Brychan: King of Brycheiniog and Family (Brian Daniel Starr, 2008). page 34.
- Bowen, E. G. (1969) Saints, Seaways and Settlements. Cardiff: University of Wales (2nd ed. 1977), p. 189.
- Brian Daniel Starr, Ascent of the Saints: Whose Lineage Is Known (Brian Daniel Starr, 2009) page 76.