Tegid Foel is known chiefly from the story of Taliesin's birth, first recorded in full in the 16th century but dating to a much earlier period.
According to the story, he lived by Bala Lake in the region of Penllyn with his wife, the sorceress Ceridwen.
Tegid's name is mentioned several times in Welsh literature in the patronymic of his more famous son Mofran; it appears in the Mabinogion tales Culhwch and Olwen[1] and The Dream of Rhonabwy,[2] and in Welsh Triads 24 and 41.
[3] Apart from Creirwy and Morfran the Welsh genealogies also name other children of Tegid.
The Vitae Sanctorum Britanniae et Genealogiae gives the following lineage: "Afan Buellt son of Cedig son of Ceredig son of Cunedda Wledig by Degfed ["Tenth"] daughter of Tegid Foel"; Rawlins MS B gives another genealogy naming another daughter, Dwywai.