because of German air raids. Some of these children, including one named Lucy (Lewis's goddaughter) stayed with him at his home The Kilns near Oxford, just as the Pevensies stayed with The Professor in The Lion, the Witch and the Wardrobe. Influences from mythology and cosmology Drew Trotter, president of the Center for Christian Study, noted that the producers of the film The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe felt that the books' plots adhere to the archetypal "monomyth" pattern as detailed in Joseph Campbell's The Hero with a Thousand Faces. Lewis was widely read in medieval Celtic literature, an influence reflected throughout the books, and most strongly in The Voyage of the Dawn Treader. The entire book imitates one of the immrama, a type of traditional Old Irish tale that combines elements of Christianity and Irish mythology to tell the story of a hero's sea journey to the Otherworld. Planet Narnia Michael Ward's 2008 book Planet Narnia proposes that each of the seven books related to one of the seven moving heavenly bodies or "planets" known in the Middle Ages according to the Ptolemaic geocentric model of cosmology (a theme to which Lewis returned habitually throughout his work). At that time, each of these heavenly bodies was believed to have certain attributes, and Ward contends that these attributes were deliberately but subtly used by Lewis to furnish elements of the stories of each book: In The Lion [the child protagonists] become monarchs under sovereign Jove; in Prince Caspian they harden under strong Mars; in The "Dawn Treader" they drink light under searching Sol; in The Silver Chair they learn obedience under subordinate Luna; in The Horse and His Boy they come to love poetry under eloquent Mercury; in The Magician's Nephew they gain life-giving fruit under fertile Venus; and in The Last Battle they suffer and die under chilling Saturn. Lewis's interest in the literary symbolism of medieval and Renaissance astrology is more overtly referenced in other works such as his study of medieval cosmology The Discarded Image, and in his early poetry as well as in Space Trilogy. Narnia scholar Paul F. Ford finds Ward's assertion that Lewis intended The Chronicles to be an embodiment of medieval astrology implausible, though Ford addresses an earlier (2003) version of Ward's thesis (also called Planet Narnia, published in the Times Literary Supplement). Ford argues that Lewis did