Bartrum's note: "c. 1500 Ithel Fn ab Ithel Gam was being confused with Ithel Fn ab Ithel Llwyd. By c. 1550 the wife and all the daughters of the former had been transferred to the latter."
cite for "of Helygain": Trans. Cym. 1968 p. 156
cite for "living 1301-20": H. Mostyn p. 192. DWB s.n. Mostyn. LD ii. 308. n.1.