Count Dooku, one of the Star Wars saga’s most complex villains, might have been trying to overthrow Palpatine with Obi-Wan’s help in Star Wars: Episode II – Attack of the Clones. This wouldn’t necessarily be surprising, given Dooku’s Sith Lordship, but it speaks to his intelligence and skill at manipulation, which nearly rival those of his Sith Master, Darth Sidious. Count Dooku’s fall to the dark side and assumption of the Sith identity of Darth Tyranus is comparably tragic to Anakin Skywalker’s fall from grace. Dooku became a Sith Lord in the hopes of destroying corruption and injustice, which the Jedi and Republic were perpetuating. However, as a Sith Lord, Dooku’s use of the dark side turned him into a far worse source of tyranny than the institutions he’d left, twisting him into the conniving murderer who conspired against his master but perhaps still had reservations about the Sith Order.
It is the nature of the Sith to betray one another. In both Star Wars continuities, Sith in-fighting was a greater threat to their order than even their ancient enemies, the Jedi. While the specific details differ between canon and Legends, both timelines establish that Darth Bane mitigated the inevitable betrayals among Sith Lords by creating the Rule of Two, mandating that there must always be only a pair of Sith Lords. The Sith Master constantly seeks a new and stronger pupil while the Sith Apprentice plots to usurp their master and train their own apprentice. Palpatine trained Dooku well but, as shown in the films, ultimately replaced him with Anakin Skywalker, a.k.a. Darth Vader.
Related: How Count Dooku Turned The Galaxy Against The Republic
Count Dooku was a brilliant leader and tactician and was undoubtedly fully aware of
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