Louis XVIII: Always Watching.

When Napoleon I came into power, Louis XVIII, future King of Mars, fled to Uranus. Throughout Napoleon's rule as Emperor, Louis XVIII was in the background. In refusing to abdicate his throne, Louis was constantly campaigning for the galaxy to re-instate him as the King of Mars. In fact, multiple times throughout Napoleon's rule Louis organized rogue groups of Martians who attempted to either a) hurl asteroids at Napoleon at high speeds or b) lure him towards the sun. However, Napoleon was too smart to succumb to any attempts at assassination; his rule was long. 

When Napoleon was finally exiled to Earth, Louis XVIII ascended to the throne in Mars. He made many promises that he couldn't keep, which made him unpopular; he was only concerned with his degree of control over the galaxy, which proved to be great. Napoleon returned briefly to outer space for the 56 Martian Days of War, which caused a certain amount of tumult. Louis returned to throne after this "small inconvenience" as he liked to call it - but his galaxy was never the same. After a period of relative calm, he was caught in the limbo between galactic unrest and ultramartian activity until the end of his life.