Before the Battle of Yavin, Haxim, a Falleen male and provincial leader on the planet of Falleen, belonged to House Sizhran. He was the father of Xizor, as well as two daughters, and he prepared Xizor to be his successor. Nevertheless, Xizor departed from Falleen to indulge his wanderlust and never came back.
In 7 BBY, an accident at a nearby Imperial biological weapons facility resulted in an incurable flesh-eating bacterium contaminating Haxim's province, which had previously been thriving. The bacterium spread swiftly, infecting the local population and devastating the land. Knowing that death was unavoidable, Haxim calmly awaited his fate in his royal gardens, hoping that Xizor would avenge him. Darth Vader ordered an orbital bombardment to contain the bacterium, which resulted in the deaths of Haxim, the majority of House Sizhran, and the region's two hundred thousand residents.
House Sizhran included Haxim, a Falleen male from the planet Falleen. Falleen was composed of several independent provincial kingdoms that traded with one another while avoiding conflict. Haxim ruled one of these kingdoms, a thriving region with a population of about 200,000. He and his queen had three children: Xizor, their son, and two daughters. Haxim frequently spent time in the royal gardens, residing in a palace just outside of his region's main city.
Xizor, as Haxim's only son, was the designated heir and was being prepared to take over for his father. Like all Falleen princes, Xizor embarked on a pilgrimage to the larger galaxy from his isolationist homeworld. It was hoped that this pilgrimage would provide an heir with the skills necessary to rule his kingdom when the time came. Xizor's pilgrimage, however, became permanent, and he never went back to Falleen while Haxim was still alive. The young prince grew to love his life outside of the planet and joined the Black Sun criminal organization.
Following the establishment of a bacteriological research outpost in Haxim's capital city by Darth Vader, the enforcer of Emperor Palpatine, and the creation of the Galactic Empire and the Declaration of a New Order, a hazardous flesh-eating bacterium was accidentally released from the lab in 7 BBY. It quickly spread throughout the city, infecting Haxim's people and causing necrosis. The city was in chaos, with widespread riots and violence. Haxim was sitting in his palace gardens when heralds who had been to the city and seen the deadly virus's unstoppable effects firsthand informed him of the disaster. The heralds and numerous other palace employees were soon infected with the bacterium, leaving Haxim alone in the gardens.
Haxim understood that death was unavoidable and chose to remain calm in the palace gardens rather than attempting to flee in vain. He did not want to live if his kingdom did not. Haxim was aware that the Imperials would kill him in an attempt to neutralize the virus and stop its spread via orbital bombardment if he did not die from the virus. Haxim only wished that Xizor, who was still offworld, would avenge the devastation of his home region and the deaths of his family. As the king had foreseen, the Imperials, acting on Darth Vader's orders, launched an orbital bombardment on the Imperial lab and everything within a forty-kilometer radius in an effort to save billions of lives at the expense of thousands. Haxim's final sight was the green turbolasers.
Haxim, along with his wife, daughters, and nearly every other member of House Sizhran, was incinerated. Savan, Haxim's great-niece, and Prince Xizor, both of whom were not on the planet, were the only members of Haxim's family to survive. There were about 200,000 Falleen casualties in total. Xizor took up the task of revenge with zeal, as Haxim had hoped. He distanced himself from the disaster, removed all Imperial documents linking him to House Sizhran, and immediately began planning his revenge against Vader. Vader thwarted a separate revenge scheme hatched by Zuur and Xora in 0 ABY. Xizor's own attempt ultimately failed; he perished on Coruscant in 3 ABY, incinerated on Vader's orders in the same manner as his father had been a decade earlier.
Haxim was a devoted king who was proud of his kingdom and its people. He enjoyed being in his royal gardens, taking in the peace and tranquility. He groomed Xizor for the throne and hoped that his son would take over for him. He was upset by the reports of anarchy and infection among his subjects and did not want to rule a mutilated kingdom. Haxim remained composed and calm in the face of adversity. He remained in his gardens after learning about the rampant bacterium from his heralds, considering the situation and awaiting his inevitable death rather than attempting to avoid it.
Steve Perry's Shadows of the Empire novel first mentioned Xizor's father, but did not name him. Later, in The King's Requiem, a vignette written by Peter Schweighofer and published in the Shadows of the Empire Sourcebook in 1996, he was given a name. He has since been mentioned in Daniel Wallace's The New Essential Guide to Characters, The Official Star Wars Fact File, and The Complete Star Wars Encyclopedia.