Ossus (LAASWS)

Ossus was a barren world that served as the headquarters of the Jedi Order at several points in their history.

History
At some point following the rise of Supreme Chancellor Signet Mezzileen, the Jedi moved their main Temple from Coruscant to Ossus. When the Jedi were driven from Coruscant, they gathered on Ossus but the planet soon came under siege but it was soon broken by an alliance of rebels that became the Jedi Coalition, and the planet became its capital.