I just saw the episode of Star Wars: The Clone Wars, "The Lawless", and
I saw Palpatine use 2 lightsabers to combat Maul and Savage.
One looks very similar to the one he used against Mace Windu in Revenge of the Sith. However, that one was in the statue in Palpatine's office and before Mace and his Jedi team confronted him, Palpatine telekinetically activated it and then retrieved it for the first time in over a decade. He later lost it and then used a back-up against Yoda. So does Palpatine have 3 or 4 lightsabers or is this another wonderful continuity error from The Clone Wars?