The Jedi Grandmaster, Satele Shan, owned a double-bladed lightsaber during the Great Galactic War.
History
Satele's lightsaber is destroyed by Darth Malgus
Satele Shan wielded her second double-bladed lightsaber during the battle of Alderaan, injuring several Sith warriors along with damaging a Mark I Sith droid before entering a duel with the Sith Lord Darth Malgus. During the duel, it was cut in half by Malgus as he tried to kill Shan.[1]
Appearances
"Hope" on The Old Republic's official website (article) (backup link) (First appearance)