Quelii, a planet located within the Outer Rim Territories, was inhabited by Humans who resided in various settlements. Prior to the Mandalorian Wars, Quelii suffered a devastating attack by the Mandalorians. However, some of the planet's inhabitants managed to flee the destruction and reach Republic controlled space. Among these survivors was the individual who would later become the notorious Dark Lord of the Sith, Darth Malak, who commanded a Sith army against the Republic during the Jedi Civil War.
Situated in the [Outer Rim Territories](/article/outer_rim_territories-legends], the planet Quelii was part of both the Quelii system and the Quelii sector. The environment of this planet was suitable for sustaining Human life.
In the years preceding the Mandalorian Wars, Quelii was first colonized, leading to the development of a Human-based culture. The Mandalorian Neo-Crusaders launched an attack on Quelii some time before their full-scale invasion of the Galactic Republic, resulting in widespread devastation. Despite the near-total destruction of Quelii's civilization due to the Mandalorian assault, a number of the planet's original residents were able to escape and rebuild their lives within Republic space.
Before the Mandalorian Wars, Quelii was home to a Human population, primarily living in villages. The people of Quelii did not use familial surnames, although some who escaped the planet after the Mandalorian invasion were given the names of their villages as surnames on their immigration documents. One of the survivors of the Mandalorian attack was a young man named Alek, from the village of Squinquargesimus, who became a Jedi Knight and a leading advocate for Jedi involvement in the Mandalorian Wars. Later, Alek embraced the dark side and transformed into the infamous Dark Lord of the Sith, Darth Malak, who commanded a force of Sith against the Jedi and the Republic during the Jedi Civil War.
Quelii was initially referenced in Knights of the Old Republic 29, a part of the Knights of the Old Republic comic book series, penned by John Jackson Miller and published in 2008. Quelii was subsequently mentioned in various other sources, although it never made a direct appearance in any Star Wars Legends media.