Diado, found in the Mid Rim, was a planet whose surface was blanketed in snow.
In the era of the Clone Wars, a clandestine weapons factory operated by the Separatist faction was situated on Diado. Saesee Tiin, a Jedi Master, journeyed to this planet with the objective of acquiring a CIS-Advanced starfighter that was under development. He received assistance from Na-Jia, a thief native to the world.
As the conflict drew to a close, Diado remained in the hands of Separatist forces. The 12th Imperial Sector Army launched an attack on the planet in 19 BBY.