Rhys ap Gruffydd of Nant in Tegeingl
Source: The History of the Princes, the Lords Marcher, and the Ancient Nobility of Powys Fadog, and the Ancient Lords of Arwystli, Cedewen, and Meirionydd by J. Y. W. Lloyd, Vol. IV, London, 1884, p. 342 shows him as "Rhys ab Gruffydd of Nant in Tegeingl ancestor of the Hugheses of Prestatyn and Feydor, and of the Lloyds of Nant, who left two daughters co-heirs: 1st, Janet, ux. Henry Wynn Conwy of Nant; and, 2ndly, Catherine, ux. Cadwaladr ab Maurice Gethin of Y Voelas."
Source: Annals and Antiquities of the Counties and County Families of Wales by Thomas Nicholas, Vol. I, London, 1872, p. 362 has "Rhys ap Gruffydd, of Nant, co. of Flint, whose representatives maternally are Wynne-Finch of Voelas, and the Wynne Conways of Nant."
From Welsh Biography Online (http://yba.llgc.org.uk/en/s1-GRIF-PEN-1300.html):
"...Bleddyn's descendants, together with those of Griffith ap Gwilym, through his youngest son, Rhys, continued to be represented in Flintshire and Denbighshire until the 16th cent. The personal connection of the family with Anglesey and Caernarvonshire began with the eldest and second sons of Griffith ap Gwilym."