About Cuhelyn Fawr ap Gwynfardd
Cuhelyn's two sons Gwrwared and Llywelyn were powerful enough to force the Norman lord of Cemais to grant the pasturage of the commons of the Presely hills to them and their heirs, to be held to the use of the commoners of the lordship, and afterwards confirmed "to the heirs of Gwrwared and Llewelyn sons of Cuhelyn"
Please see Darrell Wolcott: Einion ap Celynin of Llwydiarth; http://www.ancientwalesstudies.org/id138.html. (Steven Ferry, June 19, 2017.)
Please see Darrell Wolcott: The Welsh Ancestry of the Tudor Dynasty; http://www.ancientwalesstudies.org/id217.html. (Steven Ferry, July8, 2017.)