E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Morgan le Fay, Morgaine la Fée, or Morgana the Fairy.
Daughter of Queen Igrayne, and half-sister of King Arthur, who revealed to him the intrigues of Sir Lancelot and Guinever. She gave him a cup containing a magic draught, and Arthur had no sooner drunk it than his eyes were opened to the perfidy of his wife and friend.