What is the title of J.R.R. Tolkien’s unfinished mythology published after his death in 1977?

J.R.R. Tolkien’s unfinished mythology published after his death in 1977 is The Silmarillion.

Christopher Tolkien edited and arranged the material for publication, and George Allen & Unwin released The Silmarillion in 1977, four years after J.R.R. Tolkien died. The book presents the creation of the world and the histories of the First Age, including the Silmarils, the great Elven wars, and the rise and fall of many kingdoms.

Unlike The Hobbit and The Lord of the Rings, The Silmarillion is not a single straightforward adventure novel. It is a collection of interconnected mythic histories, legends, genealogies, and narrative sections written or revised across many decades.

Its title comes from the Silmarils, three extraordinary jewels created by Fëanor. Unfinished Tales and The Children of Húrin are also posthumous Tolkien publications, but neither is the 1977 volume that serves as the central published mythology of Middle-earth.