Caluula was a planet that made up part of the Kingdom of Cron and later Xim's empire during the Pre-Republic era. After the empire's collapse, Caluula became part of the Tion Hegemony. Near the end of the Yuuzhan Vong War, the Yuuzhan Vong conquered the planet and sent approximately one-third of its population to Coruscant for sacrifice. The planet was the site of a battle between the Yuuzhan Vong and the Galactic Alliance. Attempts by the Galactic Alliance to quarantine the planet following the war failed, and emigrants were subject to stringent decontamination procedures.