Llywelyn sided with Owain and Dafydd Gwynedd against their brother Llywelyn II in the battle of Bryn Derwin in 1255. After their defeat he went into exile in England until June 1262 when he reconciled with the Prince of Wales.
Llywelyn aligned himself with Owain and Dafydd Gwynedd against their brother Llywelyn II in the battle of Bryn Derwin in 1255. After their defeat, he went into exile in England until June 1262 when he reconciled with the Prince of Wales.