Who did Palpatine actually tell that he was a Sith Lord or was going undercover as the Chancellor of the Republic? I've got a few characters here who may have knew about him, but I'm not entirely sure who exactly knew. Count Dooku - I'm sure he told Dooku, because he played such a huge role in Palpatine's plans and the war, so he would always have to know what's going on. Plus by the look on his face when Palpatine told Anakin to kill him, he looked at him like he knew who he was. Darth Maul - I don't think he did, because I doubt Palpatine was planning on keeping him around for long because of Dooku, and Maul was only a small part of his plan, but I guess that could be part of the reason why Palpatine wants to hunt down and kill Maul and Savage, in case they know anything about his plans. General Grievous - I don't think he did, because just like Maul, he was only a part of his plan, plus Palpatine hardly even gave orders to Grievous, it was Dooku who was his leader, and as long as Dooku knew everything, then there's no point telling Grievous. Mas Amedda - I think he knew, because Palpatine would have told him so they could work together in the Galactic Senate to get whatever results Palpatine wanted, plus in an episode of The Clone Wars, Palpatine says something to him about his plan coming together. Sly Moore - I don't think she had as much of a major role with Palpatine and the Galactic Senate as Mas Amedda did, so there would probably be no point telling her. So I'd say that Count Dooku and Mas Amedda were the only ones who knew, but I could be wrong, so does anyone actually know?