The Lady of the Green Kirtle, also called Queen of Underland and Queen of the Deep Realm, is the main antagonist in The Silver Chair by C. S. Lewis. She is sometimes called briefly the Green Lady (on analogy with Jadis, the White Lady), and she is known also as the Emerald Witch; neither name, however, appears in Lewis's text. She enslaved Prince Rilian of Narnia and a horde of gnomes by her witchcraft, and planned to use them to take over Narnia. She is foiled by three friends of Aslan: Eustace Scrubb, Jill Pole, and Puddleglum, and is finally killed by Rilian. Source: Wikipedia (en)