In the novel Uneasy Lies the Crown
, this is the name given to Elen, daughter of Thomas ap Llywelyn lord of half the of commote of Is Coed and of quarter of Gwynionydd, both in Ceredigion. She was also the wife of Gruffud Fychan II. Their most famous son was Owain Glyndŵr, the last Welshman to bear the title Prince of Wales (Tywysog Cymru). Their other children included:
Madog, died young
Lowry, married Robert Puleston, and had issue.
Isabel ferch Gruffudd, married Adda ap Iorwerth Ddu, and had issue.
Tudur ap Gruffudd, Lord of GwyddelwernGruffydd Fychan II in Wikipedia