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place in post-war England, and they specifically bring in references to Tolkien's legendarium (at that time largely unpublished) and treats these references as primary fact within Lewis's fiction.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
Michael George Reuel Tolkien (born 1943) is a British poet. He is the grandson of J. R. R. Tolkien, being the eldest son of Michael H. R. Tolkien. Michael Tolkien was educated at The Oratory School in Oxford and then Ampleforth College. He studied English and Classics at St Andrews University and later a B.Phil. at Oxford. He taught as Head of English at Uppingham School until 1992. He has several volumes of published poetry including "Taking Cover", "Outstripping Gravity" and "Reaching for a Stranger." He is published by Redbeck Press. Michael Tolkien has two daughters, Catherine, born in 1969 and Ruth, born in 1982. He is married to the artist Rosemary Walters. He sits on the board of the Tolkien Company.