Today I've been wondering about something for the first time: Did Palpatine's iconic red Royal Guards have any clue whether the man they were protecting was a Sith Lord? Obviously, Palpatine had them around mostly for show, trying to create the facade of an old, robed leader in need of protection by elite guards. But did he intentionally keep them in the dark on his powers? In ROTJ he sent them away just as Luke was brought before him- so they probably saw nothing of the action that took place in the throne room afterwards. In ROTS, they weren't present during Mace Windu's ill-fated arrest attempt. Most likely the Chancellor had sent them away, so the Jedi would be led into his trap without prior obstacles. Then, when Yoda entered his sub-Senate quarters, they got knocked out cold before Palpatine could make a move. So just what were they aware of?