He was enjoying a noontide nap in his castle at Deganwy when the news was brought to him that Welsh raiders had landed in three ships underneath the Great Orme and pillaged his lands.
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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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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.