Born in 82 BBY on the planet Naboo to the aristocratic House Palpatine, Palpatine discovered the Sith at a young age as a collector of dark side artifacts. In 65 BBY, he met Hego Damask, a Muun businessman who was in reality the Sith Lord Darth Plagueis. Under Plagueis's manipulation, Palpatine killed his father and pledged himself to his new Master's dark side teachings as Darth Sidious. Palpatine lived a double life for many years, serving an untarnished career as Naboo's ambassador in the Galactic Senate while learning from his master and training a young Zabrak as the Sith assassin Darth Maul. Plagueis and Sidious, both exceptionally skilled and powerful in the Force, were able to conceal their identities from the Jedi for decades. As Plagueis privately searched for the key to eternal life, Sidious manipulated galactic politics, culminating in the blockade of Naboo by the Trade Federation. In the wake of the political crisis, the Galactic Senate voted to elect him as Supreme Chancellor, and around the same time, in accordance with Bane's Rule of Two, Sidious murdered Plagueis and usurped the role of Sith Master.

Sheev Palpatine should sound like Matt Smith or Asa Butterfield.

Asa Butterfield Example: https://www.youtube.com/watch?v=5UtmmHh4hiY 

Matt Smith example: https://youtu.be/rjfZ1Zmq7LQ?t=70