The legend of Darth Plagueis is vital in Star Wars mythology.
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Especially with his murderous student returning in Star Wars 9.
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But when did the assassination take place?
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In Legends, Plagueis is killed right after Palpatine is made Supreme Chancellor.
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In the new Disney canon, however, this is far harder to pin down.
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If Palpatine killed his master before training Maul, around 50 BBY is likely.
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If not, 39/40 BBY, since this was the time he began readying for a new apprentice.
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