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place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction.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
There are seven blue plaques in England that commemorate places associated with Tolkien: one in Oxford, one in Bournemouth, four in Birmingham and one in Leeds. One of the Birmingham plaques commemorates the inspiration provided by Sarehole Mill, near which he lived between the ages of four and eight, while two mark childhood homes up to the time he left to attend Oxford University and the other marks a hotel he stayed at before leaving for France during World War I. The plaque in West Park, Leeds, commemorates the five years Tolkien enjoyed at Leeds as Reader and then Professor of English Language at the University. The Oxford plaque commemorates the residence where Tolkien wrote "The Hobbit" and most of "The Lord of the Rings".