One of the things that we know about the world of Star Wars is that the Jedi Order has long been at war with the Sith Order.

Little has been revealed about Darth Sidious former master, the Sith Lord Darth Plagueis, in Star Wars canon. This is everything we know so far.

Seeing what his master was achieving inspired Darth Sidious to murder Plagueis in his sleep – something Plagueis was too distracted (by his quest for power and immortality) to see coming.

When Obi-Wan Kenobi cut Darth Maul in half over 25 years ago, most of us thought that was it. ... including how Maul perceives the plan formulated by his former master, Darth Sidious. ...

The inclusion of Darth Plagueis in Star Wars: The Acolyte is a topic of much speculation among fans. At the time of writing, there has been no official confirmation about his appearance in the series.

Redditor wentzitcame claims that R2 is none other than Darth Plagueis, Darth Sidious’ master. You recognize his name from the iconic Mon Calamari Ballet scene of Revenge of the Sith, ...

Despite Maul's big comeback, though, his former Master Darth Sidious (AKA the future Emperor Palpatine) never took him back as his apprentice, instead sticking with Maul's replacement, Count Dooku.

This is the Sith who appears at the end of ‘The Acolyte’ It is only a cameo and he is not named, but the Sith is almost certainly Darth Plagueis, Darth Sidious’ master.