The name of the small lake Llyn Idwal refers to an old Welsh legend. In the 12th century, Owain, Prince of Gwynedd, gave his only son Idwal into the care of his retainer Nefydd Hardd. Nefydd was commissioned to look after his master's son, but Nefydd's son Dunawd was jealous of the talented Idwal. So he pushed Idwal into this lake and he drowned. Owain banished Nefydd and his son from the kingdom and named the lake in mourning for his only son.
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