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.
The Well at the World's End
Although the novel is relatively obscure by today's standards, it has had a significant influence on many notable fantasy authors. C. S. Lewis and J. R. R. Tolkien both seem to have found inspiration in "The Well at the World's End": ancient tables of stone, "King Gandolf," a "King Peter," and a quick, white horse named "Silverfax," an obvious inspiration for "Shadowfax," are only a few. Lewis was sufficiently enamored with Morris that he wrote an essay on that author, first read to an undergraduate society at Oxford University called the Martlets and later published in the collection of essays called "Rehabilitations".