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.
An Experiment with Time
The ideas of Dunne also strongly influenced the unfinished novels "The Notion Club Papers" by J. R. R. Tolkien and "The Dark Tower" by C. S. Lewis. Both writers were members of the Inklings literary circle, and Tolkien also used Dunne's ideas about parallel time dimensions in developing the relationship between time in Middle Earth and "Lórien time".