From what I recall, Sima Yi was a Machiavellian adviser to Cao Cao, who eventually usurped the throne. However he didn't do that until after Cao Cao's death. Historically he didn't have an accomplice. If I had to fit someone into that role, it would be one of Cao Cao's relatives - maybe Cao Pi, Cao Ren, or Cao Fang ?
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