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. Desevro was named as the Fourth Throne of Xim.
After Xim's death later in 25,100 BBY, the planet became capital of the Honorable Union of Desevro & Tion, an oligarchy ruled by the Thirty-seven Families, the nobles of Desevro. The Union maintained an intense rivalry with the Kingdom of Cron.
In 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. After nearly a century of fighting, the Republic won the war by turning the Hutts against the Union, allowing them to invade the Tion Cluster. This led to the Union's end as an independent state, and with its situation desperate, Desevro offered its unconditional surrender to the Republic. It was refused: the Republic opted to sterilise Desevro as an object lesson to the rest of the Tionese.
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 and its cities fell into a precipitous decay. Desevrars, as the native Humans were called, were extremely speciesist, calling all nonhumans Hutts.
- Star Wars: The Old Republic (Mentioned only)
- The Old Republic: Annihilation
- Mission to Lianna (First mentioned)
- Geonosis and the Outer Rim Worlds
- The New Essential Chronology
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- Xim Week: The History of Xim and the Tion Cluster
- The Essential Guide to Warfare
- Star Wars: Edge of the Empire Core Rulebook