Great Jedi Purge (Earth-2042)

"For over a thousand generations, the Jedi Knights were the guardians of peace and justice in the Old Republic. Before the dark times. Before the Empire. A young Jedi named Darth Vader, who was a pupil of mine until he turned to evil, helped the Empire hunt down and destroy the Jedi Knights."

- Ben Kenobi

The Great Jedi Purge, later also known as the Jedi Purge or Palpatine's Purge, referred to the efforts initiated by the Sith Lord Darth Sidious, upon his creation of the Galactic Empire, in 19 BBY, to eradicate the Jedi Order. It resulted in the near-annihilation of the Jedi. The purge officially began with Order 66, following a botched attempt by Mace Windu and three other Jedi to arrest Sidious, who was the Supreme Chancellor. The Jedi were declared the enemies of the Republic, and the Galactic Republic Space Command was ordered to turn on them.

Source

 * https://starwars.fandom.com/wiki/Great_Jedi_Purge