Thull Vandron, a hero of the Galactic Republic around 1000 BBY, was a hyperspace explorer. This individual, Vandron, commanded a fleet of starships against the forces of the Brotherhood of Darkness. Furthermore, he played a key role in designing the Ruusan Reformations, advocating for decentralized power. However, following the Galactic Senate's choice of an alternative path, he withdrew with a contingent of Core-Worlders, utilizing clandestine trade routes to reach a region in the southern reaches of the galaxy. The area he selected consisted of a cluster of worlds surrounding a sizable nebula, which would later be known as the Senex-Juvex region. In time, the nebula became known as Thull's Shroud in his honor. It was in this region that Vandron implemented his system of noble houses across both the eastern and western sectors of the nebula. The eastern systems were allocated among the Houses of Vandron, Garonnin, Elegin, Anturi, Taneel, Petro, Araba, Hax, and Viholn, thus forming the Senex sector. The western systems were divided among the Houses of Sreethyr, Carbinol, Hallikeenovich, Sisemon, Kassido, Kellermin, Pilor, and Mekuun.