The White Witch rules Narnia in C.S. Lewis’s The Lion, the Witch and the Wardrobe.
Narnia is the central fictional land of Lewis’s seven-book series. In the first-published novel, the White Witch has imposed a perpetual winter and claims authority over the kingdom. Her rule is challenged when the Pevensie children arrive and Aslan returns.
Narnia is also the name of the wider world in which several regions and kingdoms appear, so the term can be used in more than one geographic sense. Neighboring lands include Archenland and Calormen, while later books introduce other places and historical periods.
The White Witch is also called Jadis. She first appears in the series’ internal chronology in The Magician’s Nephew, which explains her earlier connection to the world that becomes Narnia.