Which 1977 book did Christopher Tolkien edit from his father’s Middle-earth writings?

Christopher Tolkien edited The Silmarillion from his father’s Middle-earth writings, and it was published in 1977.

J.R.R. Tolkien worked on the mythology behind The Silmarillion for much of his life, but he did not complete a final version for publication. After his death in 1973, Christopher Tolkien arranged, edited, and in some places connected the surviving texts to create a coherent volume.

The book describes the creation of Eä, the history of the Valar, the Elves, and the First Age wars against Morgoth. It includes major stories such as Beren and Lúthien, Túrin Turambar, and the fall of Gondolin.

The Silmarillion is not a conventional sequel to The Lord of the Rings. It is a mythological history written in several styles, and many readers find its dense names and genealogies more demanding than Tolkien’s novels. Unfinished Tales, published later, is a separate edited collection.