Sheev Palpatine (also known as Darth Sidious or simply The Emperor) is a fictional character of the Star Wars universe, mainly portrayed by Ian McDiarmid.
In the original trilogy, he is depicted as the aged, pale-faced and cloaked Emperor of the Galactic Empire. In the prequel trilogy, he is portrayed as a charismatic Senator from Naboo who uses deception and political manipulation to rise to the position of Supreme Chancellor of the Galactic Republic.