The Mortex sector was a region situated in the Outer Rim Territories, and it was classified as a sector. Among the worlds found there were Dakot Seven, Lotide, and also Almania.
An Almanian army general named Kueller led an invasion of the sector many years prior to the Almanian Uprising which occurred in 17 ABY. Following the Battle of Yavin, a Rebel Alliance cell was formed within the sector. As the Alliance's power grew in the area, Callus was given the role of sector commander.