Lasan, a planet found within the Outer Rim Territories of the galaxy, was once settled by a faction of Lasat who had departed from their ancestral home, Lira San, in the distant past. The Lasan High Honor Guard served as protectors of this world. During the Galactic Empire's reign, Lasan suffered immense devastation at the hands of Imperial forces commanded by Alexsandr Kallus, resulting in the death of the majority of its inhabitants, although numerous Lasat continued to reside on Lira San. The stormtrooper designated TK-421 was at one time assigned to Lasan.