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The Valley was in medieval times a very valuable trade route as this article shows and was protected at both ends by Castles giving their owners the power over the trade routes from Anglesey (The Mother of Wales) into the heart lands of Welsh Power.
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How Tyn Y Mwyd may have looked at the time of Hugh D’Avranches,Earl of Chester
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This is all that is left of the fort Garreg Olau at the other end of the valley, for more details press the Dragon
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