Darth Plaguies

Information Summary
Palpatine: "Did you ever hear of the tradegy of Darth Plagueis the wise?"

Anakin Skywalker: "No,"

Palpatine:  "I thought not, it's a story the Jedi woundn't tell you. It's a Sith legend. Darth Plagueis was a Dark Lord of the Sith, so powerful and so wise that he could use the Force to influence the midichlorians to create... life. He had such a knowledge of the dark side that he could even keep the ones he cared about from dying,"

-- Palpatine and Anakin Skywalker about Darth Plagueis 19 BBY