This started as a digressive search from some mentions made in the audiobook ("The Science of Middle-earth: A New Understanding of Tolkien and His World {Audiobook – April 6, 2021}") which I posted on the FB T-e Teacher's forum [
link], although it's genesis lies much further back even before the founding of T-e: I viewed JRRT's "in-story" explanation of how the Legendarium became known to us much better served by the Tale of the Dark Age mariner Ælfwine/Eriol as opposed to just happening to find a translation of Bilbo's
Red Book resting in a textual archive somewhere...
However, it seems that most others either don't know this Tale, or don't regard it of much importance (which to me is both "a shame" and "in error" - yes, I can be arrogant like that

). So, with the hope of sparking a discussion on this issue, I shall post here first a history of the various versions of this Tale, and then an article which goes into a rather 'cultural anthropological' explanation of possible motives of JRRT in using this format, which I happen to agree with.
Comments and discussion welcomed.
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Textual And Assigned Chronological History
JRRT's Methods And Possible Motives
From what I can determine, the people who don't like this story seem to object to its multiple variants over different time periods (both compositional and assigned), but as a shaman, that is one of the things I like most about it, as the concept of
Eternal Return uses just this mode in folklore throughout the planet, and although that term is usually used at cosmological scales, some stories use it in a more compressed manner, including the modern Sci-Fi series
Battlestar Galactica.