Mission to the moons of Sanjin

Some time prior to the mission to Vassek's third moon, a mission was undertaken by Jedi Master Neebo to protect the refugees located on the moons of Sanjin. Neebo was presumed dead at the hands of General Grievous of the Confederacy of Independent Systems, and her lightsaber fell into his hands.

Behind the scenes
Sanjin was first mentioned in the episode guide for "Lair of Grievous", a part of the first season of the Star Wars: The Clone Wars television series, which aired on December 12, 2008.