Daughter and co-heir with her elder sister, the Lady Eleanor (wife of Griffith Vychan, Lord of Glyndwrdwy, and mother of Owen Glendower), of Thomas ap Llewelyn, Lord of South Wales, Representative of the Sovereign Princes of South Wales, by Eleanor Goch, his wife, daughter and heir of Philip, Lord of Iscoed, in Caerdigan, by the Princess Catherine, daughter and heir of Llewelyn, last Prince of North Wales.60