Forest Sans Retour, Lost Forest

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A wood called the Perilous Forest until Guinebal (Lancelot’s uncle) fell in love with a local lady and created the Magic Dance, which trapped all passers-by.

The lady, called the Wise Lady of the Forest of No Return, was the mother of Agraveil and aunt of Elinadas, two knights in Arthur’s service.

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Source
Vulgate Merlin | 1220-1235