[Source] The Senex sector was a sector in the Mid Rim of the galaxy, bordering the Juvex sector and near the Ninth Quadrant, located next to the Rimma Trade Route. Though the two sectors were nominally independent of each other, with both the Senex and Juvex sectors returning senators to Coruscant, in practice they were culturally and politically identical, together making up the Senex-Juvex. The sector was long independent of the Galactic Republic, ruled by an alliance of "Ancient Houses," including Elegin, Garonnin, Taneel, and Vandron (which was the oldest and noblest).