system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Is the Tragedy of Darth Plagueis the Wise forgotten by the time of Episode VII?

It would seem only Sidious knew this, as he was Plagueis' apprentice. We've only seen him tell it to Anakin, and now both are long dead, so does anyone still know the story?
gpt
"The Tragedy of Darth Plagueis" is not a "legend", it's just what Palpatine did when he was younger. He told it to Anakin like it was some Sith parable he heard somewhere so that Anakin wouldn't make an immediate connection.

It's unlikely Palpatine made a habit of leaving evidence of his evil secret past. Maybe he put his records in a holocron somewhere, but that's best case scenario, and it probably wasn't as poetic.