Middle-earth
Another example is C. S. Lewis's "Space Trilogy," in which Earth is also called Middle-earth. Lewis's novels are situated at the approximate time of World War II, with the last novel, "That Hideous Strength," taking place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction. Merlin, of King Arthur fame, is treated as a successor to the Atlantis magic found within "Numinor" (Lewis's unintentional misspelling of Númenor), and similarities can also be found in the Quenya name for Númenor, which is "Atalantë," and Lewis specifically references the earth as Middle-earth twice, both in Chapter 13, "They Have Pulled Down Deep Heaven on Their Heads". Lewis's borrowings came directly from Tolkien himself: they were close friends and shared each other's literary creations. Lewis encouraged Tolkien to persevere with his Middle-earth writings.A small selection from the many books about Tolkien and his created world:
J. R. R. Tolkien
As well as his fiction, Tolkien was also a leading author of academic literary criticism. His seminal 1936 lecture, later published as an article, revolutionized the treatment of the Anglo-Saxon epic "Beowulf" by literary critics. The essay remains highly influential in the study of Old English literature to this day. "Beowulf" is one of the most significant influences upon Tolkien's later fiction, with major details of both "The Hobbit" and "The Lord of the Rings" being adapted from the poem. The piece reveals many of the aspects of "Beowulf" which Tolkien found most inspiring, most prominently the role of monsters in literature, particularly that of the dragon which appears in the final third of the poem: