In Pwyll Pendefig Dyfed, the first branch of the Mabinogi, Hefeydd Hen (or Heyfedd the Old) was the father of Rhiannon.
In Pwyll Pendefig Dyfed, the first branc.h of the Mabinogi, Hefeydd Hen (or Heyfedd the Old) was the father of Rhiannon