Deko Neimoidia was one of many worlds colonized by the Neimoidians early during the Old Republic era, joining the Galactic Republic sometime between 25,000 BBY and 22,000 BBY.
The wealthiest and most resource-rich colony worlds were known as "purse worlds" that served as administrative posts ruling their own set of colonies. These purse worlds were the only colonies allowed to carry the name of Neimoidia.
During the Clone Wars, it was a key member of the Confederacy of Independent Systems and was defended by the Neimoidian Home Defense Legions.
It was captured by the Republic during the Clone Wars. Elements of the Republic forces included the 22nd Air Combat Wing, the Clone commandos of Ion Team, and Jedi Knight Roan Shryne.