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place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction.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:
C. S. Lewis
Lewis was schooled by private tutors until age 9, when his mother died in 1908 from cancer. His father then sent him to live and study at Wynyard School in Watford, Hertfordshire. Lewis's brother had enrolled there three years previously. The school was closed not long afterwards due to a lack of pupils; the headmaster Robert "Oldie" Capron was soon after committed to a psychiatric hospital. Lewis then attended Campbell College in the east of Belfast about a mile from his home, but left after a few months due to respiratory problems. He was then sent to the health-resort town of Malvern, Worcestershire, where he attended the preparatory school Cherbourg House, which Lewis calls "Chartres" in his autobiography. It was during this time that Lewis abandoned his childhood Christian faith and became an atheist, becoming interested in mythology and the occult. In September 1913, Lewis enrolled at Malvern College, where he remained until the following June. He found the school socially competitive. After leaving Malvern, he studied privately with William T. Kirkpatrick, his father's old tutor and former headmaster of Lurgan College.