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Enormous medieval castle, with iconic polygonal towers, constructed from the late 13th century on the orders of Edward I as part of his strategy to subjugate the Welsh. It was built on the site of an earlier Norman castle and close to where a Roman fortress had once stood. The castle and town then became the English administrative HQ for North Wales and was besieged many times - and captured too.
Caernarfon Castle is part of the World Heritage Site "Castles and Town Walls of King Edward in Gwynedd".