Rilvvan K'ntarr, a King of Rydonni Prime, also served as the chief executive of Rythani Products. This corporation provided armaments to the Galactic Empire. Following the Empire's collapse after the Battle of Endor, the portly K'ntarr held an event at his mansion. This gathering was in support of Moff Caerbellak, who had arrived on the planet to inspect a prototype weapon Rythani Products was creating for the Empire.
On the following day, K'ntarr organized a parade to celebrate the Moff's visit. During this event, the Moff learned that the prototype had been pilfered. He then threatened the king and the entire planet's inhabitants to ensure its return. It was revealed that one of the All Terrain Armored Transports participating in the parade had been seized by Sienn Sconn, the thief responsible for stealing the prototype, along with K'ntarr's daughter, Princess Kalieva K'ntarr. While Sconn and Kalieva successfully absconded with the prototype, Kalieva's allegiance was with Caerbellak all along, and she had covertly attached a tracking device to the stolen item. Subsequently, Kalieva and Caerbellak assassinated K'ntarr, establishing their joint rule over Rydonni Prime.