Deheubarth and Powys never did return to stability .
Gwynedd was once again united under the reign of Llywelyn ap Iorwerth ( Llywelyn Fawr , the Great ) , following a rather brief power struggle .
Deheubarth and Powys never did return to stability , but Gwynedd was once again united under the reign of Llywelyn ap Iorwerth ( Llywelyn Fawr , the Great ) , following a rather brief power struggle .