Lucy Pevensie is the first of the four Pevensie children to enter Narnia in C.S. Lewis’s The Lion, the Witch and the Wardrobe. She discovers the passage through a wardrobe while the children are exploring a country house.
Inside Narnia, Lucy meets Mr. Tumnus, a faun who lives near the forest. When she returns, the other children initially doubt her account. Edmund later enters Narnia as well and encounters the White Witch, while Peter and Susan become involved after the secret passage is discovered more fully.
Lucy’s first entry establishes the central contrast between belief and skepticism in the early chapters. Her experience is not merely a private dream within the story’s logic; Narnia is presented as a real world that the other children eventually reach.
Lucy remains important throughout the series and appears in several later Narnia books. She is the youngest Pevensie sibling in the first novel, while Peter is the oldest and Susan and Edmund are between them.