In all these legends the student of comparative folk-lore traces the ancient mythology, however overlain with later details. The water-maidens of every land doubtless originally were the floating clouds of the sky, or the mists of the mountain. From this have come certain fair and fanciful creations with which Indo-European folk-lore teems, the most familiar of which are Undine, Melusina, Nausicaa, and the classic Muse. In Wales, as in other lands, the myth has many forms. The dispersion of dark clouds from the mountains, by the beams of the rising sun, or the morning breezes, is localized in the legend of the Men of Ardudwy. These men make a raid on the maidens of the Vale of Clwyd, and are pursued and slaughtered by the latter's fathers and brothers. The maidens thereupon cast themselves headlong into the lake, which is thenceforth called the Maidens' Lake, or Llyn y Morwynion. In another legend, the river mist over the Cynwal is the spirit of a traitress who perished long ago in the lake. She had conspired with the sea-born pirates of the North (the ocean storms) to rob her Cambrian lord of his domains. She was defeated by the aid of a powerful enchanter (the sun), and fled up the river to the lake, accompanied by her maidens, who were drowned with her there.[29]