Ossus is a popular world of the Galactic Republic, known since 25,000 BBY. It is in the Adega System and even though it has many known cities, Knossa is its capital.
Also, Ossus' modern native species is the Ysanna, who are descendants of the survivors of the massacre that happened during the Great Sith War.
- The Jedi Academy, that was meant to replace the temple on Yavin 4. The academy was also attacked by numerous Sith Warriors, whom's objective was to kill as many Jedi as they could.
- The Great Jedi Library is a huge library and training ground for Jedi.