But which one could it be? The likely answer is that this is Darth Plagueis, the Sith Lord who will one day train Darth ...
Who is Darth Plagueis? Well, as a refresher, let’s hear it straight from Palpatine himself in the prequels, as he explains it to Anakin: "Did you ever hear the tragedy of Darth Plagueis The Wise?