Gruffudd was now powerful enough to ensure that his nominee, David the Scot was consecrated as Bishop of Bangor in 1120.
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Gruffudd landed on Anglesey with an Irish force, and with the assistance of troops provided by the Norman Robert of Rhuddlan first defeated and killed Cynwrig ap Rhiwallon, an ally of Trahaearn who held Llŷn, then defeated Trahaearn himself in the battle of Gwaed Erw in Meirionnydd and gained control of Gwynedd.
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The armies of the two confederacies met at the Battle of Mynydd Carn, with Gruffudd and Rhys victorious and Trahaearn, Caradog and Meilyr all being killed.
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Gruffudd then led his forces eastwards to reclaim territories taken over by the Normans, and despite the assistance previously given by Robert of Rhuddlan attacked and destroyed Rhuddlan castle.
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The see had been effectively vacant since Bishop Hervey le Breton had been forced to flee by the Welsh almost twenty years before, since Gruffudd and King Henry could not agree on a candidate.
Selyf ap Cynan | Maredudd ap Cynan ab Owain Gwynedd | Llywelyn the Elder ap Maredudd ap Cynan ab Owain Gwynedd | Gruffudd Hiraethog | Gruffudd Fychan II | Gruffudd ap Cynan | Gruffudd ab Owain Glyndŵr |
It was founded in 1158-9 and dedicated to the Virgin Mary under the patronage of Maredudd ap Cynan ab Owain Gwynedd (d. 1212), Lord of Merioneth and grandson of Owain Gwyned and his brother, Gruffudd ap Cynan, prince of N. Wales (d. 1200).