British - A magical sword, in Welsh lore. This was one of the objects that Ysbaddaden required Culhwch to get in his quest for the hand of Olwen. In some versions it was the sword of Rhydderch from which flames appeared when it was drawn by anybody other than the owner. In other accounts it was the sword of Gwrnach. Some accounts include it as one of the Thirteen Treasures of Britain collected by Merlin. Also commonly called Dyrnwyn.

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