Mirial was the homeworld of the Mirialans, including Luminara Unduli and Barriss Offee, and was a cold, dry planet located near the Hydian Way. The Mirialans joined the galactic community prior to 3951 BBY. During the Jedi Civil War, Mirial aligned with the Sith Empire, returning to the Republic after Darth Malak's death. The planet later fought in a war against a neighboring planet, and triumphed, thanks in part to Arwen Cohl. During the Clone Wars, the planet was located within Separatist space.