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place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction.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:
Tolkien family
Simon Mario Reuel Tolkien (born 1959) is a British barrister and novelist. He is the grandson of J. R. R. Tolkien. He is the only son of Christopher Tolkien and his first wife, Faith Faulconbridge. Simon Tolkien was educated at the Dragon School in Oxford and then Downside School. He studied modern history at Trinity College, Oxford. In 1984, he married Tracey Steinberg who was born in 1962. They have two children, a son, Nicholas, and a daughter, Anna. Tracey Tolkien owned and operated a vintage clothing store in Chelsea, London, "Steinberg & Tolkien" which shut in September 2007. She has also published several books on vintage clothing and jewellery. Simon became a barrister in 1994, specializing in criminal defence and prosecution. Their son Nicholas is a playwright and director who debuted with his first play "Terezin", in June 2017.