What is the name of the first Narnia book in the series’ internal chronology?

The Magician’s Nephew is the first Narnia book in the series’ internal chronology. Published in 1955, it describes the creation of Narnia by Aslan and explains the origins of several features later seen in the series, including the wardrobe and the White Witch’s presence in that world.

The story follows Digory Kirke and Polly Plummer, who travel between worlds using magical rings made through the experiments of Digory’s uncle Andrew. Their journey brings them into contact with Jadis, who becomes the White Witch, and culminates in their witnessing the birth of Narnia.

The Magician’s Nephew was published sixth, after several other Narnia books. Readers therefore encounter two common reading orders: publication order and chronological order. The question of the first book depends on which of those meanings is intended.