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I don't think the "unauthenticated" part is necessary, but a legend is a story told about somebody else, a traditional story, and it can't be a "tradition" if it is being told for the first time by...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/48243 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/48243 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
I don't think the "unauthenticated" part is necessary, but a legend is a story told about somebody else, a **traditional** story, and it can't be a "tradition" if it is being told for the first time by the MC. In fiction, an original story titled a "legend" is fine, but the pretense would have to be this was done long ago by the MC and is being told once again.