In the Gifts of Corn and Bread Novel:
Niamh Cinn Oir means Golden-Haired Niamh. She is the daughter of the King of Sidhe. She may look incredibly beautiful, but that's only because of the gift of her kind for creating glamour; she can make you think you see absolutely anything at all, it's only limited by her imagination. Niamh has very little in the way of morals - mortals are put there for her amusement, and as such, she can and will do as she pleases with any mortal she comes across. Amuse her enough and she might play nice. One warning - accept no food from the Sidhe princess, for the merest morsel or tiniest drop of water traps you in the world of Sidhe until such time as she releases you...