Rule of One (Palpatine's Doctrine)

This Rule of One was created by Palpatine shortly after he established his Empire, to replace the Rule of Two. His Rule of One first proposed in his writing Absolute Power, basically stated that he would hold all the power, and other's talented in the Force would execute his will as dark side agents. These agents replicated a smattering of Palpatine's abilities, and did'nt even take a fraction of his authority.

Behind the Scenes
This Rule of One is almost identical to Sith Lord, Darth Krayt, who lived almost 100 years later. It is most likely a coincidence.