Palpatine, also known as Darth Sidious, was a Force-sensitive Human male who served as the last Supreme Chancellor of the Galactic Republic and the first Emperor of the Galactic Empire. A Dark Lord of the Sith who followed the Rule of Two, an ancient tenet of the Order of the Sith Lords, he was the most powerful Sith Lord in galactic history. His entire life as a Sith was the culmination of a thousand-year plan to overthrow the Republic and the Jedi Order from within.
http://starwars.wikia.com/wiki/Palpatine
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