Penman “Here be Dragons” p. 285, makes him brother to Gwenllian verch Rhys who m Ednyfed Fychan. But, Online db (Univ. of Hull?) I had him son of Gwenwynwyn of Powys.

Gramps ID S0454

References

    1. Birth, Prince of Deheubarth, Rhys Gryg ap Rhys [E45006]
    2. Prince of Deheubarth, Rhys Gryg ap Rhys [I33732]