- Sheev Palpatine elected to representNaboo in the Galactic Senate, being aided by the influence of his Sith Master Darth Plagueis.
- Star Wars: Rogue One: The Ultimate Visual Guide
- "A Certain Point of View" — Star Wars Insider 200
- Star Wars: Timelines: It is stated that Palpatine's rise as senator was aided by Plagueis in 52BBY, so this implies that Plagueis was still alive and mentoring Sidious.