The next branch in the family tree is Rhiwallon (JE-1) [also spelled Rywallon]. He was the son of Dingad (JD-3), who was the son of Tudor Trevor (JC-1) given in Burke p.844 as "Rywallon (Rywallon ap Dingad ap Tudor-Trevor, Lord of Bromfield, co. Denibigh". He lived just before the Norman invasion when Wales was in grips of what could be call "Family Feuds". Civil war, lots of head knocking, and killing of cousins to gain that upper position. [lived ca. 1000 AD - 1050 AD]
His spouse was named Lettice. Her father was name Cadwaladr the son of Peredur Goch. So goes the family tree.