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.
With that said, it's almost certain that Dooku did know the truth about the Chancellor, and that the criticism and kidnapping was all part of Dooku's act to foster war within the galaxy. In Revenge of the Sith, the "captured" Palpatine eggs Anakin on to kill Dooku, prompting a look of betrayal in the Count's face.
Dooku was not one for bloodlust. Instead, he attempted to convince Obi-Wan in Attack of the Clones that the Jedi Order was more complicated than he may think: The Jedi are just as much the enemy as Darth Sidious, at least in Dooku's mind.
For his short time as a Sith, Count Dooku was well aware of Star Wars' Rule of Two. 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.
How Dooku Uncovered That Palpatine Was a SITH - Star Wars Explained
Was Count Dooku actually a good guy?
While Dooku was certainly evil -- and even had a Darth sobriquet, Tyranus, that he rarely used -- he was never quite a Sith, at least not in the true sense. Unlike those who espoused the Sith doctrine, Dooku wasn't motivated by hatred or fear, but by the same purpose that drove him as a Jedi.
Dooku voluntarily left the light side behind and became Darth Sidious' dark side disciple, taking the secret name Darth Tyranus and leading the Separatist army.
Sith eyes really only appear in those actively giving themselves up to the dark side. Palpatine is regularly seen without them, and Dooku seems to be a rather composed individual, given his alignment. It seems they're not permanent physical changes.
We see this when Dooku confronts Obi-Wan and asks him for help destroying the Sith. He's telling the truth. He does want to destroy the Sith, he just wants to destroy the Jedi as well and enforce a government tailored to his particular ideals. "You must join me, and together we will destroy the Sith!"
Why didn't Count Dooku tell Anakin about Palpatine?
They explain nearly EVERYTHING. In the novel, Dooku remains silent when Sidious tells Anakin to kill him, because he finally realised, that he had been replaced. His master has found a new apprentice, younger, filled with more rawness and power to destroy the Jedi.
Sidious may have given Dooku the title of Darth Tyranus, but because the Jedi Order knew him as Count Dooku, greatly preferring to not indulge his role as a Sith, they continued to call him by that name.
Studying Jedi Archive records, Dooku based his new weapon design after the curved hilts that were standard during the heyday of Form II lightsaber combat. The curve allowed the hilt to fit better into his hand, allowing for superior finesse and precise blade control.
Obi-Wan saw Qui-Gon as a brother by the end of his training. Although Qui-Gon never felt close with him, Dooku was quite fond of his former pupil, and Jinn's death on Naboo devastated him.
Following Qui-Gon's death by Maul's hand on Naboo, Dooku visited Palpatine in distress about his apprentice's death, hoping to have one day made Jinn an ally while also directly stating he knew of Maul's existence.
Sidious revealed to Maul that he did not intend to kill his former apprentice, as he still had use for Maul; it was Sidious' hope that Maul would lead the Sith to Mother Talzin, Maul's mother and the leader of the Nightsisters, so she could be eliminated as a potential threat to the eventual Sith rule of the galaxy.
Even though they were both trained by Palpatine, Dooku and his predecessor, Maul have been enemies every since his mind was restored by Mother Talzin. This is because the two hated each other.
Obi Wan was unable to defeat Count Dooku because the Count was a significantly better lightsaber duelist. Originally Answered: Why couldn't Obi-Wan defeat Count Dooku? Funny really, Obi Wan rarely ever succeeds when he and Anakin are fighting the same enemy at the same time.
His Sith name he did try to keep secret from the Jedi, but by the end of the war they knew for sure that he was Tyrannus and that he was Darth Sideous's apprentice. The majority of people probably don't even know what the Sith are, so it wouldn't hurt his reputation.
History. A dark side warrior with a mysterious past, Kylo Ren was neither Jedi nor Sith, but a product of both sides' teachings. Once an apprentice of Luke Skywalker's, he killed his fellow students and drove Skywalker into exile, becoming a First Order warlord and servant of Supreme Leader Snoke.
In The Clone Wars, the dark side attacks Ahsoka from the outside, forcing her to develop Sith eyes and give in to her darker tendencies. In Ahsoka, her eyes turn yellow of her own accord, as she briefly considers killing her vision of Anakin Skywalker and ending his influence over her once and for all.
Mission to Mathas. Padawan Windu was trained in the ways of the Force by Jedi Master Cyslin Myr. Following his early trials as a youngling, Windu attained the status of Padawan by becoming Jedi Master Cyslin Myr's apprentice.
