 Rhys's grandfather, Rhys ap Tewdwr, was king of Deheubarth, and was killed at Brecon in 1093 by Bernard de Neufmarché. Following his death, most of Deheubarth was taken over by the Normans. Rhys's father, Gruffydd ap Rhys, eventually was able to become ruler of a small portion, and more territory was won back by Rhys's older brothers after Gruffydd's death. Rhys became ruler of Deheubarth in 1155. He was forced to submit to King Henry II of England in 1158. Henry invaded Deheubarth in 1163, stripped Rhys of all his lands and took him prisoner. A few weeks later he was released and given back a small part of his holdings. Rhys made an alliance with Owain Gwynedd and, after the failure of another invasion of Wales by Henry in 1165, was able to win back most of his lands.
