J.R.R. Tolkien gave the fictional history of Middle-earth published posthumously in 1977 the title The Silmarillion.
The Silmarillion was edited and arranged by Tolkien’s son Christopher Tolkien and published after J.R.R. Tolkien’s death. It presents stories from the creation of the world through the First Age and later events, including the history of the Silmarils, the great jewels made by Fëanor.
Unlike The Hobbit and The Lord of the Rings, the book is not a single continuous novel with one central viewpoint. It combines mythic accounts, annals, genealogies, and narrative tales. Its opening section, the Ainulindalë, describes the creation of the world through music.
Unfinished Tales and The History of Middle-earth are related posthumous publications, but they are different books. The Silmarillion became the best-known single volume presenting Tolkien’s deeper mythology.