Born on the Mid Rim planet Naboo around 84 BBY during the Republic Era, Sidious possessed a strong connection to the Force, and was secretly trained in the ways of the Sith by Darth Plagueis. He eventually killed his Sith Master in order to train his own Sith apprentice, Darth Maul, for the Rule of Two limited their ranks to two Sith Lords at any given time. As a result of the Invasion of Naboo, a crisis orchestrated by Sidious, the Senate elected Palpatine as Supreme Chancellor. The Separatist Crisis and the Clone Wars were masterminded by Sidious and his new apprentice, Darth Tyranus, in an effort to achieve galactic dominance. Following an attempt to arrest the chancellor, the Great Jedi Purge commenced with Sidious enacting Order 66.