Lianna was conquered by warlords from Tion in the planet's early history, though it later fell under the jurisdiction of the Kingdom of Barseg during the time of the Galactic Republic. It was never, however, a part of Xim's Empire. The Galactic Senate overlooked Lianna, so the planet continued to be ruled as a traditional territory.
At approximately 300 BBY, the Senate eventually decided to take control of Lianna from Barseg, though some two hundred years later, Sienar Technologies set up operations on Lianna, after the planet continued to be misused as an industrial center even after the Senate's intervention. Soon after, the company was taken over by Kerred Santhe, who moved his company's headquarters to Lianna.[3]
Lianna from space.
Under the control of Kerred's granddaughter, Valles Santhe, the planet remained independent, though it eventually supported the Republic during the Clone Wars, during which the Battle of Lianna was fought. The battle destroyed much of Lianna's urban sprawl.
At this point, Lady Santhe was in control of Lianna and the Allied Tion, and though the New Republic was respectful enough of her command not to intercede on her rule, surviving Imperial forces launched a series of reprisal attacks on the planet. Fortunately, as Lianna produced many of the Empire's TIE fighters, Santhe was able to hold off the attacks by threatening to cease production. The threat, plus some well-placed bribes, allowed Lianna to remain neutral by special charter of the Empire.[6][7]
A standard day on Lianna lasted for twenty-two standard hours, and a year encompassed three hundred and seventy local days.[3]
The Allied Tion appears as an independent government that issued letters of marque during the New Republic in Pirates & Privateers. As Lianna was likewise an independent world, it is probable that the Allied Tion sector surrounding the world became part of Lady Santhe's independent state.