Sienar Fleet Systems / Legends Sienar Fleet Systems or SFS ( owned by the massive company Santhe / Sienar Technologies ) was a major starship manufacturer . Through their Sienar Design Systems subsidiary , they were also responsible for many drive and power systems . History . Sienar Fleet Systems , along with Kuat Drive Yards and the Corellian Engineering Corporation , was one of the major suppliers of military vessels for the Galactic Empire : whereas KDY was famous for designing massive Star Destroyers , SFS was best - known as the supplier of the small , yet deadly TIE fighters . Yet SFS also created the massive I - a2b solar ionization reactor that powered the " Imperial " - class Star Destroyer and dictated the size and design of its mile - long hull : in effect , KDY built the " Imperial " - class around a huge Sienar drive system . SFS , originally Republic Sienar Systems , was founded over 15 millennia before the Battle of Yavin by the wealthy Sienar family , apparently on Corulag . Over the millennia , they produced designs such as the Sienar Battleship and the " Interdictor " - class cruiser . A century before the Battle of Yavin , the Sienars united with the Santhe family of Lianna , who owned Santhe Security , due to an arranged marriage . Although this gave the Santhe family something of the status of a ruling dynasty within the merged Santhe / Sienar , scions of the Sienar lineage retained operational control of the ship - design section of the conglomerate : father and son Narro Sienar and Raith Sienar served as successive CEOs for many years in the last decades of the Old Republic and under the Galactic Empire . Under the covert patronage of Senator Palpatine , Raith Sienar established Sienar Design Systems and its Advanced Projects Laboratory , which were apparently responsible for designing Darth Maul ' s Sith Infiltrator : although Raith Sienar fiercely denied any connection to the craft , it does seem that it was connected to Advanced Projects designs , including the starfighter prototypes that would develop into the T . I . E . starfighter and early TIE series designs . By 29 BBY , Raith Sienar had also produced the original Expeditionary Battle Planetoid design that later became the Death Star . Even after the Clone Wars ended with the Declaration of a New Order in 19 BBY , the Sienar Fleet System , alongside Kuat Drive Yards , continued to produce warships , ground vehicles and other war machines at a quick pace , because of Palpatine ' s desire to extend Imperial rule throughout the civilized galaxy . This in turn led to the Reconquest of the Rim taking place from 19 BBY to 17 BBY . Under the Empire ' s rule , SFS produced an immense variety of military spacecraft . Most were relatively small — starfighters , patrol ship s and planetary defense pickets — but as well as the power systems for the " Imperial " - class design , Sienar also built the 600 meter " Vindicator " - class heavy cruiser to a design produced by Wilhuff Tarkin , and its Immobilizer 418 interdictor variant . Raith Sienar seems to have remained in control of SFS until after the Battle of Endor , but when he was killed in an assassination , Lady Valles Santhe of the Santhes dynasty took direct control of the company , and continued to control it after the collapse of the Empire . She then created Sienar Army Systems when the Emperor Palpatine was reborn in the body of a clone . After the defeat of Grand Admiral Thrawn , the company began supplying vessels to all buyers , including the New Republic . SFS was loyal to the Galactic Alliance by 40 ABY , producing the " Freebooter " - class transport and the " Aleph " - class starfighter . By the time of the Sith – Imperial War , however , they were producing the " Predator " - class fighter and other spacecraft for the revived Empire .