We are the Jedi Ancients. When the Sith returned and attacked, Grand Master Zym know there would a lot of behind the scenes activity involved. So he appointed Master Sykes to create this hidden base on Coruscants moon. We are pretty much the Jedi Black Ops, so to speak.
— Jen Twile to Kolus Salcar
The Temple of the Jedi Ancients was the headquarters of the Jedi Ancients, the secret special forces branch of the Jedi Order during the Great Galactic War. In 3,681 BBY when the Sith returned to Known Space, the temple was constructed on Hesperidium, the resort moon of Coruscant.