Forest Sans Retour, Lost Forest
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.
Source
Vulgate Merlin | 1220-1235
