THE SILMARILLION

"The Silmarillion /sɪlməˈrɪlᵻən/ 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,[2] who later became a noted fantasy writer. The Silmarillion, along with J. R. R. Tolkien's other works, forms an extensive, though incomplete, narrative that describes the universe of Eä in which are found the lands of Valinor, Beleriand, Númenor, and Middle-earth within which The Hobbit and The Lord of the Rings take place." https://en.wikipedia.org/wiki/The_Silmarillion