What was the title of C.S. Lewis’s first Narnia novel by internal chronology?

The Magician’s Nephew is the first Narnia novel by the story’s internal chronology.

Published in 1955, The Magician’s Nephew explains the creation of Narnia and introduces events that occur before The Lion, the Witch and the Wardrobe. Digory Kirke and Polly Plummer travel between worlds using magical rings, encounter Jadis, and witness Aslan bringing Narnia into being. The book also explains how the wardrobe’s wood becomes connected to Narnia.

The chronology can cause confusion because The Magician’s Nephew was the sixth Narnia book published, not the first. The Lion, the Witch and the Wardrobe appeared in 1950 and was the first Narnia novel Lewis released. Many modern editions number the books according to internal chronology, placing The Magician’s Nephew first, while publication-order lists place it sixth. Both systems describe the same seven-book series but answer different questions.