Originally Answered: Did General Grievous know Darth Sidious was Palpatine? No. In the novelization of Revenge of the Sith, he makes several remarks to the effect that he clearly has no qualms about killing “Chancellor” Palpatine , or letting him die as a result of his hostage status.
Atleast those knew for sure that palpatine was darth sidious before he became emperor of the galaxy. Count Dooku definetly knew, Mas Amedda, Tarkin, and Maul possibly knew.
Sidious wasn't scared of Grievous as he served him as a means to an end, rather that he was concerned about what the Kaleesh Cyborg would do if he ever knew about Sidious orchestrating both sides during The Clone Wars.
A Sith Lord with the ability to cheat death and create life, Plagueis is the enigmatic mentor of Sheev Palpatine / Darth Sidious, who, in accordance to the Sith's Rule of Two, eventually betrays Plagueis by murdering him in his sleep, taking his place as Sith Master.
Even in the old Star Wars canon, the two had a confrontation, as they met in the comic book Star Wars Tales #9, where Maul pieced together that Anakin was Vader.
Indeed he did. Dooku (aka Darth Tyrannus) knew his master's identity. At this point the Jedi thought Dooku was the Sith Master. The kidnapping was planned to reinforce public support for Palpatine while further confusing the Jedi about his true identity.
Grievous Hero commanded the heroic Subjugator-class heavy cruiser Malevolence and followed Dooku's orders. Dooku later got fed up with Grievous's "failures" (due to plot armor) and tried to kill the heroic General by having a trap set up for him to "test his skills" in Grievous's castle.
In fact, he even planned on replacing Palpatine before Order 66. Out of all the Sith seen throughout Star Wars, Count Dooku still stands apart from them all. While he was undoubtedly evil, he often had a calm politeness rather than maniacal behavior.
Maul most likely knew Sidious' double role as Palpatine and Sidious when he served as Palpatine's apprentice. He definitely knew about Palpatine's goal of creating a galactic empire ruled by the Sith. Maul knows that Sidious is the Emperor.
that Anakin and General Grievous have never met before. So during the Clone Wars show, the writers had to make sure that the 2. never encountered one another. in order to maintain continuity, though there were some extremely close calls.
R2-D2 was present when Padmé gave birth to Leia and Luke, so he knew Luke was Anakin's son – but what he didn't know was that Anakin became Darth Vader. In addition to that, Anakin's fall was surely a painful event in R2-D2's life, one that he definitely wouldn't like to remember or even talk about.
Instead, the diminutive droid appears to have kept his own counsel, perhaps wary of interfering too much in Luke's personal journey. C-3PO lost those memories, but he remained with Han and Leia's family after Return of the Jedi, so can reasonably be assumed to have learned the truth by eavesdropping.
All clones were given a behavioral modification biochip that could be activated by remote order via voice command; Supreme Chancellor Sheev Palpatine, for example, only needed to tell clones to execute Order 66, and the order was carried out.
The death of Gallia and the defeat of Grievous demonstrates the latter's greatest strength and weakness: intimidation. Most Jedi cannot help but fear Grievous, but Mace Windu does not, allowing him to defeat the General twice.
