Question: Who is the paternal grandfather of Iefan Ab Owain Gwynedd?
Sentence (from "Iefan ab Owain Gwynedd"): Iefan ab Owain Gwynedd was a son of Owain Gwynedd (the king of Gwynedd between 1137–1170) and his second wife Cristina ferch Gronw.
Relevant evidence: Yes