The Silmarillion
by Tolkien
The Silmarillion is a collection of J. R. R. Tolkien's mythopoeic works, edited and published posthumously by his son Christopher Tolkien in 1977, with assistance from Guy Gavriel Kay, who later became a noted fantasy writer. The Silmarillion, along with J. R. R. Tolkien's other works, forms a comprehensive, yet incomplete, narrative that describes the universe of Middle-earth within which The Hobbit and The Lord of the Rings take place.
