Arthurien about the Arthurian legend. Legend The large pond of Comper is related to Viviane, the Lady of the Lake. In the legend, she lives in a crystal palace, built by Merlin and hidden under the waters of the lake. See also Centre de l'Imaginaire Arthurien List of castles in France References Castles in Brittany Châteaux in Morbihan Monuments historiques of Morbihan