760 Cynan, son of Ruadrach d.
Griffith ap Cynan, of the royal house of Gwynedd, who had been first an exile in Ireland, and later a prisoner at Chester, once more returned to his native land, and defied the Norman barons with success, whilst Henry I.
The confused reign of Stephen was naturally favourable to the development of Cymric liberty, and with such strong princes as Owen, son of Griffith ap Cynan, heir to the throne of Gwynedd, and with Griffith ap Rhys ruling at Dynevor, the prospects of the Cymry grew brighter.
The following year (1137) saw the deaths of the two powerful princes, Griffith ap Cynan, " the sovereign and protector and peacemaker of all Wales," and Griffith ap Rhys, " the light and the strength and the gentleness of the men of the south."
Peace was made with Owen of Gwynedd, the successor of Griffith ap Cynan, and with Rhys ap Griffith of South Wales.