Commander Cody receiving instructions to initiate order 66.
Order 66 was one of a series of contingency orders that the clone troopers of the Grand Army of the Republic were trained to prepare for during their growth. The order branded the Jedi as traitors of the Republic and called for their immediate execution without question. Its issuing by Supreme Chancellor Palpatine marked the formal beginning of the Great Jedi Purge, starting the rise of the Galactic Empire, and it was chief among the atrocities that led to the Galactic Civil War.
Almost all of the Jedi were killed by Order 66, and most of the survivors were killed in the Great Jedi Purge that followed. The Jedi Order survived through acts of Jedi, such as Obi-Wan Kenobi and Yoda teaching Luke Skywalker the ways of the Force.
Artwork by Ashasylum