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place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction.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
At the age of 16, Tolkien met Edith Mary Bratt, who was three years his senior, when he and his brother Hilary moved into the boarding house where she lived in Duchess Road, Edgbaston. According to Humphrey Carpenter,
His guardian, Father Morgan, viewed Edith as the reason for Tolkien's having "muffed" his exams and considered it "altogether unfortunate" that his surrogate son was romantically involved with an older, Protestant woman. He prohibited him from meeting, talking to, or even corresponding with her until he was 21. He obeyed this prohibition to the letter, with one notable early exception, over which Father Morgan threatened to cut short his university career if he did not stop.