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place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction.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
In 1945, Tolkien moved to Merton College, Oxford, becoming the Merton Professor of English Language and Literature, in which post he remained until his retirement in 1959. He served as an external examiner for University College, Dublin, for many years. In 1954 Tolkien received an honorary degree from the National University of Ireland (of which U.C.D. was a constituent college). Tolkien completed "The Lord of the Rings" in 1948, close to a decade after the first sketches.