Griffith ap Ednyfed Vychan of Henglawdd
Source: A Genealogical and Heraldic Dictionary of the Landed Gentry of Great Britain & Ireland" by John Burke & John Bernard Burke, vol. I, London, 1847, p. 737 has "Griffith ap Ednyfed Vychan, of Henglawdd, who, in the words of an ancient Welsh chronicler, 'was forced to flee into Ireland for the scandal he suffered on account of the Princess Joan, dau. of John, King of England, and wife of Llewelyn ap Iorwerth, King of North Wales.' Griffith m. twice; by his first wife he was father of, Sir Rhys Griffith,...by his second wife, Gwenllian, dau of Howell ap Trehearn, Lord of Brecknock, was father of SIR HOWEL AP GRIFFITH,KNT., who m. Tanghost, dau. of David Goch ap Howell..."