Owain meanwhile had been freed by Henry after his father's death in the hope that he would start a civil war in Gwynedd, but he remained at Chester, so that when Dafydd died unexpectedly in February 1246 without leaving an heir, his brother Llywelyn, who had supported his uncle against the king, had the advantage of being on the spot.
Though initially paying homage to the English, Owain and Llywelyn soon broke with Henry III in protest over the ruthless raids being conducted on the Welsh borders.
The third brother, Dafydd ap Gruffudd, came of age soon afterwards, and King Henry accepted his homage and announced his intention of giving him a part of the already much reduced Gwynedd.
And then Llywelyn and his men, trusting in God, awaited, unafraid on Bryn Derwin the fierce coming of his brothers, and a mighty host along with them.
Upon being released, Owain retired to his estate in north-west Wales and never again mounted a serious challenge to his brother Llywelyn's rule.