J. R. R. Tolkien
The request for a sequel prompted Tolkien to begin what would become his most famous work: the epic novel "The Lord of the Rings" (originally published in three volumes 1954–1955). Tolkien spent more than ten years writing the primary narrative and appendices for "The Lord of the Rings", during which time he received the constant support of the Inklings, in particular his closest friend C. S. Lewis, the author of "The Chronicles of Narnia". Both "The Hobbit" and "The Lord of the Rings" are set against the background of "The Silmarillion", but in a time long after it.
On Fairy-Stories
Tolkien was among the pioneers of the genre that we would now call fantasy writing. In particular, his stories—together with those of C. S. Lewis—were among the first to establish the convention of an alternative world or universe as the setting for speculative fiction. Most earlier works with styles similar to Tolkien's, such as the science fiction of H. G. Wells or the Gothic romances of Mary Shelley, were set in a world that is recognisably that of the author and introduced only a single fantastic element—or at most a fantastic milieu within the author's world, as with Lovecraft or Howard. Tolkien departed from this; his work was nominally part of the history of our own world, but did not have the close linkage to history or contemporary times that his precursors had.