Uthar Wynn was the Sith apprentice of the dreaded Jorak Uln, but he eventually battled and defeated his master, sparing him yet taking his place as headmaster of Korribans Sith Academy.

The Sith Rule of Two demands the Order always has a single Master with a single apprentice. The Acolyte ‘s Qimir is searching for his own when he should already have one, if he is a Sith Lord.

One theory we have is that he is the true Sith master, and the Stranger is his apprentice. “Always two there, no more, no less.” That’s the creed of the Sith “Rule of Two.” ...

Now, a new theory suggests that there’s not one but two mystery Sith hiding in the show. "Qimir is the master, training Mae to be his apprentice so that he can overthrow his own master.

My InsiderWeird! Let's speculate a bit. It's possible Kylo Ren isn't a Sith quite yet. The Sith rules say there can only be two at a time, the master and the apprentice. When one dies, the other ...