system
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human
[Star Wars] Who knew about Darth Sidious' plan before it was executed?

Palpatine usually had other senators or his entourage around him. Did any of them have any knowledge of his master plan?
gpt
Maul seems to have known most of it. He knew a war was coming, as when Savage mentions the Clone Wars he isn't surprised or confused. Just disappointed that they started without him. And with his replacement (Dooku) heading the CIS, he definitely knew his former master controlled both sides. Maul also seems to know that the clones are involved somehow in palpatines ultimate plan, but he was unaware of the specifics until order 66 occurs.

Dooku was also aware of the vast majority of the plan, including order 66, as we see in season 6 of The Clone Wars. Also interesting to note is that according to The Revenge of the Sith novelization, Dooku was under the impression that he would serving as a legislative head in the new empire, and Skywalker would take command of the military. Although with the whole "rule of 2" thing he really should have realized that he would be discarded once he had played his part.

Also, Mas Ammeda and Sly Moore were close advisers to Palpatine and knew of his Sith Identity, so they may have had some knowledge of it.