Before the Galactic Republic was formed, Desevro was the capital of the Livien League before being conquered by Xim the Despot c. 25,130 BBY, and became one of his two capital worlds, along with Argai. In 25,100 BBY, Xim ordered a secret vault built on the Swampland estate of his Desevrar chamberlain.
24,000 BBY, the Union made war with the young Galactic Republic. This proved its undoing. The Republic dropped volleys of pressure bombs on Desevro, and the Desevrars gave Coruscant the same treatment. The Republic won the war by turning the Hutts against the Union. This led to the Union's end as an independent state. The worlds of the Union joined the Republic by 23,900 BBY as a member sector with Tion as the capital; Desevro, however, bitterly refused to follow the crowd and remained proudly independent. As a result, the planet became a political backwater even for the Outer Rim. Desevrars, as the native Humans were called, were extremely speciesist, calling all nonhumans Hutts.