General Grievous, Sith Conspirator, Non-Force User a.k.a. Qymaen Jai Sheelal
Leadder of the Federation Droid Armies. So far, Grievous has collected several lightsabers from Jedi he has defeated, including K'Kruhk, Shak Ti, Ki Adi Mundi, Sha Gi and many others. He is defeated by Obi-Wan Kenobi on Utapau and the lightsabers he a carried were lost among the rubble of destruction.
Saber Source: EpIII: Revenge of the Sith (Film)