That said, Plagueis underestimated Palpatine, leading to his own demise at the hands of his apprentice who surpassed his master's wisdom. Darth Sidious' betrayal marked the passing of the torch ...

The apprentice who kills Plagueis that story is referring to is meant to be Palpatine, Darth Sidious. But before Sidious, the idea appears to be that during his artificially extended life ...

We also see Plagueis as the apprentice of Darth Tenebrous, a Bith dark lord who in the first chapter takes his Large Adult Student to the planet of Bal’demnic to find a cortosis vein.

The Acolyte actor Manny Jacinto recently revealed if he thinks there is a connection between Darth Plagueis and Qimir.