Govannon
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In the Welsh mythology, Gofannon was a smith and the son of the goddess Dôn. He killed his nephew, Dylan Eil Don, not knowing who he was. One of the tasks given to Culhwch if he were to win the hand of Olwen was to get Gofannon to sharpen Amaethon's plough.
His Irish equivalent was Goibniu, the cognate Gallo-Roman god was Gobannus.