Summary
- The Grand Inquisitor, a corrupted Jedi, was seduced by the Sith in the wake of Order 66 after being disenfranchised by the Jedi Order.
- Ahsoka Tano's departure from the Jedi Order greatly impacted the Grand Inquisitor, leading him to eventually embrace the dark side.
- The Grand Inquisitor lost faith in the Jedi Order after the Jedi Temple bombing, ultimately leading him to serve Palpatine and become the leader of the Inquisitorius.
Star Wars' Grand Inquisitor had a very dark past as a corrupted Jedi, connecting to both Revenge of the Sith's Order 66 and just before during the Clone Wars as well. Like the majority of the Empire's Inquisitors, the Grand Inquisitor was once a disenfranchised member of the Jedi Order seduced into serving the Sith following the Jedi Purge. To that end, the established canon has confirmed that Ahsoka Tano played a role in the Grand Inquisitor's turn to the dark side.
Having received further confirmation in the new Star Wars: Dawn of Rebellion The Visual Guide by Pablo Hidalgo and Emily Shkoukani along with past references, Ahsoka's final days with the Jedi Order greatly impacted the Grand Inquisitor when he was still a Jedi Temple Guard. However, this was merely the final straw as the Grand Inquisitor had already grown quite angered with the Jedi Order throughout his career. As such, he became a prime target for Palpatine during his search for future Inquisitors just before the events of Order 66. Here's the Grand Inquisitor's Jedi history and corruption explained.