John

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 was a Jedi Master who was very powerful and found out that Palpatine  was really a Sith   HE did not the Jedi high Council because he knew they weren't belive him as years came by when the clone wars came he didn't fight in it as he stay in the Jedi Temple when order 66 came and Anakin came with clone tropers and attacked the Temple he had escape 5 years later Darth Vader found as there fight Darth Vader was able to turn him to the dark side and he became a high inquisitor  (expand and explain)