Question: when was the book by J.R.R. Tolkien that Bilbo Baggins is the title character and protagonist originally published?
Sentence (from "Bilbo Baggins"): In Tolkien's narrative conceit, in which all the writings of Middle-earth are translations from the fictitious volume of "The Red Book of Westmarch", Bilbo is the author of "The Hobbit" and translator of various "works from the elvish" (as mentioned in the end of "The Return of the King").
Relevant evidence: No