The Anvil (The Raj Whitehall Series: The General, Book 3)

With the aid of a sentient battle computer from before the collapse of interstellar civilization, Raj Whitehall has come close to reuniting the entire planet of Bellevue. Raj is loved by the people, who hold him in awe, but the half-mad jealousy and fear of his emperor is about to force Raj to revolt or face death by torture.