The events described in The Silmarillion, as in J. R. R. Tolkien's extensive Middle-earth writings which the book summarises, were meant to have taken place at some time in Earth's past. In keeping with this idea, The Silmarillion was supposedly translated from Bilbo's three-volume Translations from the Elvish, which he wrote while at Rivendell. The book covers the history of the world, Arda, up to the Third Age, in five sections.

The book was a commercial success, topping The New York Times Fiction Best Seller list in October 1977. Le Monde called The Silmarillion a "cornerstone of Tolkien's imagination" and "the book by J. R. R. Tolkien that rules them all".

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