Orthodox wisdom states Coel Hen was the son of Tegfan. However, I believe he was the son of Godebog m. Tegfan. My evidence for this claim is that the earliest documents say so, namely HG 10 and JC 5. It is in later documents that one sees the name Coel Godebog and it was wrongly assumed that this individual was Coel Hen. This brings me to the second element of my conjecture which is that the Godebog mentioned in the early documents was stating just the cognomen of Coel Hen’s father. So, my assertion is the pedigree runs thus:
Coel Hen m. Coel Godebog m. Tegfan.
These conjectures dovetail naturally with much of the other known genealogical information such as the dating of Cunedda Wledig as the husband of Gwawl f. Coel Hen as indicated by JC 20 7:
“Mam veibyon Cuneda oed Wawl verch Coyl hen.”
“Mother of the sons of Cunedda was Gwawl, daughter of Coel Hen.”
A later manuscript, ByA 27a appears to contradict this by suggesting Ystradwel f. Gadeon was:
“… gwreig i Goel godebawc hon oedd vam Dyfrwr a mam Genev ap Koel”
“… wife of Coel Godebog was mother to Dyfrwr and the mother to Ceneu son of Coel”