Fictional land ruled by Aslan (6)

I believe the answer is:

narnia

(Other definitions for narnia that I've seen before include "Land of the Lion, the Witch and the Wardrobe" , "C. S. Lewis's imaginary land" , "C .S. Lewis fantasy land" , "The Land of Lions, Witches and Wardrobes?" , "In territory of Lewis" .)

I've seen this clue in The New York Times.

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