Griffith, elder son, Prince of Powys and Wenwynwyn. He married Hawys, daughter of John le Strange, feudal Lord of Knockyn and Cheswardine, and by her, who had a royal grant of the Manor of Strettondale, he had 6 sons and 1 daughter.
Sources:
Roscomyl's History of Flame Bearers of Welsh History.
Burke's Dormant and Extinct Peerage, pp. 113-115, 117, 213, 242,371-2, 537.
Lewis' Manuscripts, pp. 260, 261.
Nicholas' Annals and Antiquities of Wales, Vol. 1, pp. 1-15.
Nichols Herald and Genealogist, Vol. 6, pp. 97-99.