Lewis said that when he wrote The Lion, the Witch and the Wardrobe, he had no idea that he would be writing another book about Narnia and that once the idea for Prince Caspian came to him, he did not realize his Caspian stories would become three novels. Thus Prince Caspian can be read as a reflection of Lewis's believing that there was more to be said and as part of a desire to continue to explore the possibilities of a world other than Earth, as well as a curiosity about how Earth and Narnia's world might continue to interact.

Only true Sons of Adam and Daughters of Eve may rule Narnia, whatever their effect, and the Telmarine kings, being from Earth, fulfill this rule. On the other hand, in The Magician's Nephew, Aslan tells King Frank and Queen Helen that they must rule justly, never...