J.R.R. Tolkien’s mythology collection published in 1977 is The Silmarillion.
The Silmarillion was edited and prepared for publication by Tolkien’s son Christopher Tolkien after Tolkien’s death. George Allen & Unwin published it on 15 September 1977. The book presents the history of Tolkien’s imagined world from its creation through the First Age and beyond, including the great wars against the original Dark Lord, Morgoth.
Unlike The Hobbit, The Silmarillion is not a single linear adventure novel. It combines creation mythology, annal-like history, genealogical material, and narrative tales. Its central sections include the Valaquenta, the Quenta Silmarillion, and accounts of later ages.
Readers sometimes mistake it for a direct prequel written in one finished form. Tolkien worked on related material for decades, revising it repeatedly, and Christopher had to make editorial decisions when assembling the 1977 volume.