Columus

Columus was a planet in the Core Worlds's Columus system and the homeworld of the Columi species. A low-gravity, geologically-stable planet, Columus lacked any geographic features and possessed a shallow soil layer, causing its native plants to form horizontal root systems. The Columi species evolved to sentience remarkably early in the history of the galaxy, achieving interstellar travel by the year 100,000 BBY. However, the Columi were disappointed by their failure to contact any other species with intelligence on par with their own, and they retreated to Columus and remained in isolation on their homeworld. Around 24,500 BBY, during the First Great Schism, Columus was the site of the pivotal Battle of Columus between the Jedi Order and the Legions of Lettow, a battle in which the Legions' leader General Xendor was slain. Columus later joined the Galactic Republic and its successor state the Galactic Empire, though the Columi's decision to join the Empire was motivated by a desire to maintain their isolation.

Text and facts from the “Columus/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.