From the same reference (Burke 1884) on p. 1035, he presents Tudor Trevor. The following is recorded:
"Tudor Trevor (Lord of Hereford, Whittington, and both Maelors; founder of the Tribe of the Marches, surnamed Trevor, from the place of his birth, co. Denbigh, son of Ynyr ap Cadforch, Lord of Whittington and both Maelors, in Powys, by Rheingar, his wife, dau. and heir of Lluddoca ap Caradoc Vreichfras, Lord of Hereford, in South Wales."
A fairly long list of families that descended from Tudor Trevor are then given including "Jones of Llwynon". After 50 years of genealogy tree climbing, it would show that my family roots are here.
"Per bend sinister erm. and ermines a lion ramp. or."