Question: During what decade did J.R.R. Tolkien use mythopoeia in his literary works?
Sentence (from "The Silmarillion"): "The Silmarillion", along with J. R. R. Tolkien's other works, forms an extensive, though incomplete, narrative that describes the universe of Eä in which are found the lands of Valinor, Beleriand, Númenor, and Middle-earth within which "The Hobbit" and "The Lord of the Rings" take place.
Relevant evidence: No