Question: Who is Catrin Ferch Owain Glyndŵr's paternal grandfather?
Sentence (from "Catrin ferch Owain Glyndŵr"): Catrin ferch Owain Glyndŵr (died 1413) was one of the daughters (probably the eldest) of Margaret Hanmer and Owain Glyndŵr, and her marriage to a claimant on the English throne was used by her father to gain support.
Relevant evidence: Yes