Bartrum's "Welsh Classical Dictionary". A list of sons of Rhodri Mawr in JC 20 says: "Morgant; Nest oed y vam ef." This Morgan is not mentioned elsewhere and the correct reading should probably be "Nest [ferch Rhodri Mawr] mam Morgant." That is, Nest mother of Morgan Hen ab Owain. She is thus described in two manuscripts of c.1600, Mostyn MS.212b p.58 and Llyfr Baglan, p.95. She is said to be illegitimate.