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I would advise against it. In a historical novel, you do not want to "tamper" with history. That is, you do not want to create a character close enough to a historical figure to be able to re-write...
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#2: Initial revision
I would advise against it. In a historical novel, you do not want to "tamper" with history. That is, you do not want to create a character close enough to a historical figure to be able to re-write history. People who are familiar with the actual history of the historical figure might resent this. The exception to this rule might be if a historical figure would be the main character. There is a saying for a historical novel, "Your fiction's main characters ought to be minor characters in history, and your (main) historical characters should be minor characters in your fiction." You can make your hero say, a bodyguard to George Washington. "Everyone" knows that such figures have bodyguards and practically no one cares who they are. You can even allow your bodyguard hero to overhear Washington's battle plans and react accordingly. But your character should not be close enough to Washington to "talk back," or "consult" with him on battle plans, thereby affecting the course of history. Unless, of course s/he did so in real life.