All too often, squabbling Sith in their bid for power upended carefully laid plans. After the Sith were decimated by the Jedi Knights of a thousand years ago, Bane enacted the Sith rule of two: there would be only two active Sith at one time -- a Dark Lord to embody the power, and an apprentice to crave it.
Sidious broke the Rule of Two at least twice: once by training Darth Maul while still under the tutelage of Darth Plagueis; and secondly, by taking on two apprentices at once, and in the form of two Jedi: Count Dooku, the former Padawan of the legendary Jedi Master Yoda, dubbed Darth Tyranus, and the Fosh Jedi Vergere.
The real answer is that the Inquisitors, like the Night Sisters and Ventress and post-TCW Maul, are not considered to be Sith by Palpatine, who as the master gets to decide who is and isn't Sith.
[1] In the Star Wars Universe, the Rule of Two means that only two Sith Lords can exist at any given time. Apparently, there's always (and only!) a master Sith and an apprentice Sith.
In 2017 The Star Wars Show live streamed a Star Wars celebration, during which Liam Neeson, who played Qui-Gon Jinn, also confirmed the Darth Jar-Jar theory, saying “(Jar-Jar) did go to the Dark Side.”
Aftermath. Although Order 66 greatly depleted the Jedi Order's ranks, with an estimated less than 100 Jedi surviving it, it was only the beginning of the Great Jedi Purge, which stretched on for years and claimed the lives of many of the survivors of the initial onslaught.
The Rule of Two was a decree for the Sith established by Sith Lord Darth Bane so they could operate in secret and eventually get revenge on the Jedi Order for their near extinction in the Jedi-Sith War.
Fall to the dark side
The events with Offee and Tano left the future Grand Inquisitor feeling disaffected, and he lost faith in the Jedi Order. This left him susceptible to the pull of the dark side of the Force, and ultimately fell to the dark side.
By contrast, the Inquisitors were exempt from the Rule of Two, partly to protect the Sith code, but also to avoid the infighting that had led to their pre-Bane downfall. Related: Star Wars: How Did The Jedi Know Of The Rule Of Two?
In cannon it's heavily implied that Palpatine, using Plagueis research was the one to conceive Anakin via the force. They aren't related, and he didn't sleep with Shmi. It was a remote conception.
In the Star Wars universe, Darth Bane is a powerful Sith Lord who lived one thousand years before the events of the films and is known for being the originator of the Sith's "Rule of Two", which states: "One master and one apprentice can be the only Sith in the galaxy at a time".
The strongest among the Exiles, Ajunta Pall, became the first to hold the title Dark Lord of the Sith. His contemporaries, such as Karness Muur and XoXaan, became Sith Lords. The human Dark Jedi interbred with the Sith species, who also had an affinity for the Dark Side. They would become the original Sith Empire.
In the time of the High Republic, Plagueis was already actively working against the Jedi, many years before the fall of the Order. But Plagueis was killed by his apprentice, the former Sheev Palpatine, after teaching his pupil all he knew.
Maul is introduced as a Zabrak from Dathomir and a powerful Sith Lord, having been trained in the ways of the dark side of the Force as Darth Sidious' first apprentice.
In the original trilogy, Yoda lives in solitude on the swamp planet Dagobah. He is introduced as a former mentor of Obi-Wan Kenobi, and he trains Luke Skywalker in the ways of the Force until his death at the age of 900.
Bil Valen (also known as the Sixth Brother) is an Inquisitor and the main antagonist of Star Wars Disney novel Ahsoka and a secondary antagonist in Darth Vader: Dark Lord of the Sith, by Marvel Comics. He was defeated and killed by Ahsoka Tano.
The very first Jedi in Star Wars canon is a nameless figure known as the Prime Jedi. He was likely the builder of the first Jedi Temple on Ahch-To, seen in The Last Jedi. According to the Star Wars: The Last Jedi: The Visual Dictionary, the mosaic of stones in the chamber of the Temple depicts the Prime Jedi.
Darth Plagueis was a legendary Muun Dark Lord of the Sith trained by the Sith Master Darth Tenebrous. At some point during his life, Plagueis acquired the protocol droid 11-4D. During his time as a Sith Lord and studying the Force, Plagueis acquired a vast amount of knowledge about the dark side and its teachings.
Neither Jedi nor Sith, Kylo used the pain of his emotional conflict to fuel his extraordinary powers, and dedicated himself to destroying the last traces of the Jedi tradition.
Order 67 was an order requiring clone troopers to dance and clean their armor.
No. Absolutely not." Jar Jar Binks was subsequently reimagined as the Sith Lord Darth Jar Jar for LEGO Star Wars: Rebuild the Galaxy.
4 Ood Bnar Lived for Over 5,000 Years
Living from 5,000 BBY until 10 ABY, Ood Bnar is one of the oldest Jedi chronologically and one of the oldest in age, living through many ages.