A sector existed in the galactic Mid Rim. In the initial stages of the Imperial Era, Governor Ahr held dominion over the sector, with the responsibility of suppressing hostile entities within its boundaries. When an attack occurred against insurgents situated on Namzor, Darth Vader acted against Ahr's explicit instructions. Consequently, Emperor Palpatine decreed that Vader must adhere to Ahr's directives. Ahr orchestrated various offensives across different planets within the sector, consistently placing Vader in perilous circumstances; however, the Sith Lord overcame each trial, returning to Ahr's presence. Consumed by rage, Ahr then ordered Vader to eliminate a creature located in the Kankalo Belt Containment Zone, but instead, Vader permitted the creature to slay the governor.