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Darth Vader's Master is technically the Emperor when he was a Sith, but when he was training as a Jedi his master was Obi-Wan Kenobi
Darth Plagueis' master's name was the Sith Lord Darth Tenebrous.
Darth Ruin's master has not been revealed yet
Darth Vader's old master was Obi Wan.
It was widely assumed that Palpatine's master was Darth Plagueis.
Darth Plageuis was the Palpitine's sith master.
himself ,his master is Darth sidius
darth sidious was the apprentice and darth plagues the wise was the master until sidious killed his master and took on an apprentice of his own, darth maul.
Not much is known about Darth Plagueis. One thing I know is that Darth Plagueis's species was a Muun, but no one knows who his master was
Darth Plagueis' master was Darth Tenebrous. He was a male Bith Dark Lord of the Sith and played a significant role in training and shaping Plagueis into a powerful Sith Lord.
Count Dooku was trained as a Sith by Darth Sidious, also known as Emperor Palpatine. Darth Sidious was responsible for turning him to the dark side and giving him the Sith name Darth Tyranus.
It was me