The Jedi didn't know Palpatine was evil because he masterfully used the Force to hide his presence, masked his Sith identity behind a public persona as a benevolent Chancellor, and the growing darkness of the Sith Lords (Sidious and Plagueis) actually clouded the Jedi's ability to sense the truth, making them complacent and focused on the wrong suspects within his administration.
They had a general feeling but they thought that the Sith was someone in Palpatine's inner cycle not Palpatine himself. The Jedi, according to Labyrinth of Evil, were operating under the assumption the Sith were an external threat trying to take over the Republic and galaxy that way.
There are a few reasons, one Palpatine was able to hide his force abilities, and two the Temple was built over an old Sith temple and while the Jedi 'purified' the Temple the dark stuff was starting to leak back out. Also, complacency would be an additional element.
Count Dooku - himself revealed to be a Sith Lord - revealed to the captured Jedi Knight Obi-Wan Kenobi on Geonosis in 22 BBY that a Sith named Darth Sidious held influence over several senators in the Galactic Senate; it was the first such time that the Jedi learnt about Sidious in name.
No, Darth Plagueis is not Anakin Skywalker's father; Anakin had no biological father, being born of the Force itself in response to Plagueis's dark side manipulations, with Palpatine's tales of Plagueis's power over life being a manipulation to turn Anakin to the dark side, though Plagueis's attempts to create life did inadvertently cause Anakin's conception.
Darth Maul is the weakest. Bane was strong : he killed all the Sith and lots of Jedi.
The answer, revealed in Episode IX: The Rise of Skywalker, rewrote much of what we thought we knew. Rey is the granddaughter of Emperor Palpatine, also known as Darth Sidious or Sheev Palpatine—not through a traditional lineage, but through a failed clone named Dathan, Rey's father.
I think it has a lot to do with Mace's technique, Vaapad. He basically had the ability to turn Palp's power against him. In the prequels, Yoda is referenced as a great lightsaber duelist while Mace was referenced as being powerful. Mace overpowered Palpatine's lightning and turned it back on him.
Three years later, we have the events of Empire Strikes Back so he is 87 years old and for 30 years, it was believed that Emperor Palpatine had died age 88 on the Second Death Star and finally, thirty-five ABY, a hundred and90 years old, Emperor Palpatine returns on screen for the Rise of Skywalker where he should be ...
They couldn't sense Palpatine because of his own immense power. He used the Dark Side of the Force to cloud the judgement of nearly every being in the galaxy, to the point where the Jedi have trouble sending events. This is stated in Episode II.
Plagueis was fully aware Sidious was training Maul as a Sith assassin. Plagueis knew about Maul, Maul suspected Sidious had another master but didn't know for sure. Plagueis had actually intended to end the rule of two with himself and bring back the Sith numbers so he encouraged Sidious.
Seems pretty easy to deduce for Ahsoka. She knew there was a dark Lord of the sith who had control of the Senate. Palpatine was disfigured after an attack by the Jedi.
Snoke and his many copies were not a clone of any known individual the way the Clone Army soldiers were modified copies of Jango Fett. Nor was he a one-for-one recreation of a previous body like Palpatine's clone body. Snoke was an entirely new being made from scratch, and Dr.
Darth Vectivus. He basically got all the power he wanted and then retired to live with his family and friends and died peacefully, none of the Sith backstabbing.
In canon it was Kirak Infil'a , Cere Junda, Obi-Wan and Lord Momin . All messed him up quite badly with Kirak winning round 1 but losing round 2 and Momin cutting off his arm. Obi-Wan actually beat Vader. In Legends it was Shaa Koon, An'ya Kuro, a clone of Maul and Galen Marek.
It's pretty clear that Dooku is meant to be a step above Maul. The only edge Maul has is durability and raw explosive physicality due to being much younger but it's not something Dooku wouldn't handle IMO. If Episode 1 Obi and Season 7 Ahsoka can outplay Maul then what hope does he have against Dooku?
Qimir has already been calling himself Darth Venamis, and is ready to officially be a Sith Lord Apprentice, but, is also already conspiring to get a pupil of his own, & eventually kill his own master as well.
Matthew J Meyer George Lucas has stated: "Anakin Skywalker was conceived by the midi-chlorians, but it was Palpatine who manipulated the midi-chlorians to create Anakin" (Source: "Star Wars: Episode III - Revenge of the Sith" DVD commentary, 2005).