Rhys Gwyg ap Rhys Lord of Yestradtywy

   Another name for Rhys was Rhys-Gryd Lord of Yestradtywy.

  Research Notes:

Source: A History of Wales by John Davies, London, 2007

Source: Welsh Settlement of Pennsylvania by Charles H. Browning, Philadelphia, 1912. From that book, p. 281:
"RHY-GRYD, feudal lord of Yestradywy. He m. Lady Joan, daughter of Richard de Clare*, fourth Earl of Hertford, &c., one of the celebrated twenty-five Sureties for the Magna Charta, 1215,..."

From: A History of Wales by John Davies, London, 2007, pp. 130-131:
"In Deheubarth [about 1194], Rhys ap Gruffudd was troubled by the waywardness of his sons, and the agreement between Rhys and the king of England came to an end when Henry II was succeeded by his son, Richard I, in 1189. Rhys died in 1197. His heir was his eldest son, Gruffudd, whom Chronica de Wallia referred to in 1200 as prince, the last of the rulers of Deheubarth to be given that title. Gruffudd was challenged by his brothers, Maelgwn and Rhys Gryg in particular, and following his death in 1201 the authority of his son, Rhys Ieuanc, was restricted to Cantref Mawr, the region between the rivers Tywi and Teifi. In the struggles in Deheubarth, Maelgwn received the support of John who became king of England on the death of his brother, Richard, in 1199. John had direct interests in Wals, for, through his marriage with the heiress of Glamorgan, he was lord of the greatest of the Marcher Lordships. In 1199, John bestowed Ceredigion and Emlyn on Maelgwn through royal grant.."

Rhys married Joan de Clare, daughter of Richard de Clare 6th Earl of Clare and Amice FitzWilliam Countess of Gloucester. (Joan de Clare was born in 1184 in Hertford, Hertfordshire, England.)