- "During the opening battles of the Mandalorian Wars, the Cathar were nearly destroyed when an army of Mandalorians beseiged the Cathar homeworld. The Mandalorians systematically slaughtered the Cathar population as their Basilisk war droids swept across the planet. Only a few Cathar escaped the slaughter, fleeing to Republic space until the war had ended."
- ―In-game Codex (Planets)
Cathar is the homeworld of the Cathar species which it shares it's name.
The planet was a battlefield during the Mandalorian Wars, and almost the entire Cathar species was massacred. The Republic Military eventually drove the Mandalorians from the planet, but it was all but abandonded due to the devastation. Although the planet officially belongs in the Galactic Republic, the Cathar relocated to the planet Rendili because of their homeworld's hostile war aftermath.