In Star Wars‘ original trilogy, it seemed the only threats to Emperor Palpatine were the Rebellion and, in the end, Darth Vader; however, one crucial connection between Star Wars: Tales of the Empire and The Mandalorian proves that, even in the Imperial ranks, Palpatine was destined to fail. Palpatine is no doubt one of Star Wars’ most powerful Sith, but his plan wasn’t flawless. In fact, though many Star Wars movies and TV shows are about or heavily impacted by Palpatine’s creation and dominance of the Empire, even among people who should have been his allies, Palpatine had enemies.
https://screenrant.com/star-wars-tales-of-the-empire-palpatine-traitors/