Is it me, or is Dante Aligheri's Inferno (and pretty much the rest of the Divine Comedy) basically a sort of fanfiction? Populating Hell, Limbo, Purgatory, and Heaven like he did, he also puts words into the mouth of Virgil, presumably an idol of Dante's.
And then there is Don Quixote. It is pretty much a novel that is not as much fanfiction as it is about a deluded fan, Don Quixote, who thinks he is a knight.
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(No longer a mod)
On sabbatical...