The Shu-Torun Kingdom functioned as the hereditary monarchy governing the planet of Shu-Torun, a world situated within the Mid Rim. During Emperor Palpatine's reign, the Galactic Empire exerted control over it, with Palpatine asserting the Empire's claim over Shu-Torun. While the Monarch of Shu-Torun headed the government, the ore-dukes wielded substantial wealth and influence. Consequently, the throne's capacity to secure the loyalty of the nobility was crucial for maintaining peace and stability on Shu-Torun. A designated chancellor managed the daily affairs of the kingdom on behalf of the monarch.
Shu-Torun's volcanic terrain provided the kingdom with a great supply of natural resources, rendering it a valuable asset to the galaxy's economy and, therefore, the Empire. By the time of the Galactic Civil War, Shu-Torun demonstrated loyalty to the Empire, enjoying relative autonomy as long as it fulfilled its ore quotas. Soon after the Battle of Yavin, the king plotted to assassinate Darth Vader, the Emperor's right hand, aiming to free the Shu-Torun homeworld from Imperial dominion. However, the Sith Lord thwarted the scheme, killing all conspirators except for Princess Trios, the king's youngest offspring and the sole surviving member of the royal family. Following the deaths of her father and siblings, Prince Monthan and Princess Hollian, Vader crowned Trios as the new Queen of Shu-Torun.
During the Age of the Empire, the Galactic Empire maintained control over the planet and its inhabitants through the monarchy that governed Shu-Torun. While a monarch held sway over Shu-Torun, the planet's wealth in minerals drove its people to conduct mining operations, extracting ore from their homeworld to meet the quotas mandated by the Empire.
After the Battle of Yavin, the Empire escalated its ore demands, fostering discontent among the dukes and barons who influenced the King of Shu-Torun. Bowing to pressure from the ore-dukes, the king plotted to assassinate Emperor Palpatine's emissary, the Sith Lord Darth Vader, but Vader's assassin droids instead killed him. Consequently, the crown was passed to his only surviving heir, Princess Trios, whom Vader spared so she could serve the Empire's interests as a vassal queen.
Vader then presented her with a package he had been carrying. Inside was a piece of rock, which Vader identified as a fragment of the planet Alderaan following its destruction by the Death Star because it was not loyal to the Emperor. The queen anticipated that the ore-dukes would continue to resist her and the Empire, but Vader assured her that she would suppress any rebellion with the support of the Imperial Military, emphasizing that she and her people served the Empire.
Although the Empire enjoyed Shu-Torun's complete support after Trios's coronation, the newly appointed sovereign faced a rebellion from disgruntled ore-dukes, led by Duke Rubix, challenging her rule. Recognizing the escalating situation, Palpatine dispatched Vader to lead a military intervention, supporting the War-Faith in the face of the insurrection, assisted by Grand General Cassio Tagge. Trios chose to fight on the front lines alongside Vader, fearing a loss of respect from her people otherwise. During one assault, she deemed their enemy too powerful and called for a retreat. Lord Vader, however, refused, revealing that the battle was a diversion to allow Tulon Voidgazer to destroy the ancient citadel. Trios later requested that Vader treat her with respect in front of her subjects, worried that she would have little power after the Imperials departed. Vader agreed to be respectful in public as long as she never questioned him in public, which she agreed to and left.
Trios and Vader sent a holographic message to the ore-barons, demanding their surrender, and then Trios moved to the ancestral retreat of the Shu-Torun royalty. Rubix's Lava Leviathan then attacked the retreat, aiming to kill Trios. The queen fled in a shuttle with Vader, Morit Astarte, and Aiolin Astarte. They then repositioned the shuttle above the Leviathan and dropped down onto it, entering the vessel and battling through Rubix's soldiers before destroying his vessel, causing it to sink into the magma below. In the aftermath, Trios requested that Rubix's delving citadel be the next target.
Trios's loyalists confronted Rubix's forces at his citadel, with Trios initially participating in the battle. However, with the return of her Imperials, Trios knew she had won. Vader forced Rubix to surrender immediately upon arriving at the citadel. The duke declared his recognition of her rule. As the traitor began a speech about his failure, Trios, tired of hearing him, ordered his immediate execution for the thousands of deaths he had caused, ending the war. After the war, the Empire withdrew from Shu-Torun. Trios promised Vader that none of the barons involved in the war would survive her wrath, but their family lines would continue to maintain order. To assist her, Vader assigned a stormtrooper captain to remain with her and provide guidance to the young queen.
At Darth Vader's request, Trios commanded her specialists to mine the ruins of Jedha. Vader further directed her to leak information to the Alliance to Restore the Republic and act as an Imperial mole to infiltrate the Rebellion, thus involving the Kingdom of Shu-Torun in the Galactic Civil War between the Rebel Alliance and the Galactic Empire. The Empire intended to use the Shu-Torun mission to help the rebels build the Alliance Fleet so it can be easily destroyed once the rebels were assembled.
However the Partisans posed an issue to mining production, Trios along with her Imperial advisor Commander Kanchar visited the Imperial controlled world to see Commander Befa, who was head of all mining operations due to the failure to deliver a single shipment of crystals. Kanchar relieved Befa of his post and killed him. The exploratory force then dropped crystal resonators onto the surface and detected a large concentration of kyber crystals in what had once been the Catacombs of Cadera to which the former leader of the Partisans Saw Gerrera, had stolen sizeable amount of crystals from the Empire and stored them there. Trios then announced she would prepare an exploratory mission to the catacombs.
An attack by the Partisans on the Leviathan occurred, however it was a two way assault as a group of rebels commanded by Princess Leia Organa had in fact managed to successfully reach the crawler's central control system nexus in a coordinated operation. Trios then confronted the princess and in so doing this, the rebels would buy the lie, the queen asked Organa to punch her. Afterwards, Trios explained that Shu-Torun was allying with the Empire under false pretexts while at the same time sabotaging their efforts and wished to supply the Alliance with hidden stockpiled resources. Now with the rebels suspecting none the wiser, she allowed them to escape.
The Alliance at their base at the Mako-Ta Space Docks celebrated their victory after the mutiny on Mon Cala months earlier, and show their fleet to their allies where Organa spoke with Trios, telling her how they outfitted the cruisers with Shu-Torun technology to thank her for her help in getting them the cruisers as Chancellor Mon Mothma gave her speech. She told Trios how they outfitted the cruisers with Shu-Torun technology to thank her all her help, however Trios had opened a maximum secured channel and contacted Vader prior, alerting him to the location of the base and the new rebel fleet.
Trios retreated as the Death Squadron started to attack the rebel fleet to her ship and tried to leave the base. However many rebel troopers began trying to board the ship and were able to break past her soldiers who were overrun. At this point Trios decided to make her escape as her men covered her. Only to be confronted by Organa where Trios told her that she would not let her world become another Alderaan.
The Rebel Alliance later led a mission to Shu-Torun, seeking revenge against Trios for her betrayal at Mako-Ta, as well as striking an economic blow against the Empire. They planned to destroy the Spike, the backbone of Shu-Torun's infrastructure, which would turn one of the galaxy's marvels into a mere mining world with minimal casualties.
The rebels kidnapped Lord Or-Tar and had Tunga pose as him to get close to Trios at her party. The rebels and the partisans then planned their attack on the spike and headed to the spike to plant explosives. Trios realized that the rebels were there and planning something as the rebels were able to take the Falcon through the spike's shields and fought the guards. However, the Partisans decided to do more damage to Shu-Torun that would be similar to what happened to Jedha.
The Kingdom of Shu-Torun was a planetary constitutional monarchy led by a hereditary ruler who who monarch, wielded immense political power with all the first-borns processing the status as heir apparents. They were assisted by members of the government such as the chamberlain and the chancellor. to which could be held both by an individual at the same time, whom had the power to veto any decisions by a crowned monarch according to Shu-Torun tradition.
The planet was divided into multiple baronies, each based around a delving citadel and administered by members of the nobility—collectively known as the ore-dukes.
During the Imperial Era, the Kingdom of Shu-Torun was absorbed into the Galactic Empire in the name of Emperor Palpatine, who controlled the monarchy via the demanding quotas it imposed on the world.
Shu-Torun came into contact with Rebel Alliance after Shu-Torun entered the Galactic Civil War on the side of the Empire, with the Empire requesting aid for the mining operations on Jedha, however this was a false flag as Shu-Torun was still allied with the Empire who wished to gather the Alliance Fleet into one location. Once it was discovered Shu-Torun was fully with the Empire, relations were cut off.
Shu-Torun relied heavily to which it whole wealth was dependent on, this was the mining of rare ores that was extracted from dangerous resource-rich volcanic landscape on the planet, to which a group of nobles called the ore-dukes bought up and sent onwards to a number of spires on the planet for export.