Drezzi, governed by a monarchy, existed as a planet within the Drezzi system. This system was located in the Esstran sector of the Outer Rim's territories. At some point prior to 3954 BBY, the Sith Empire conquered Drezzi, and the husband of Queen Ressa of Drezzi, met his death at the hands of Dark Councilor Darth Nyriss. As an act of gratitude for Nyriss sparing her life and the lives of her children, Ressa gifted the Sith Lord with a decorative holoprojection, which was then put on display at Nyriss's residence. During his time as an intelligence operative, Rane Kovach undertook an assignment on Drezzi for Theron Shan of the Republic Strategic Information Service; Kovach's mission involved infiltrating dissident organizations and instigating a revolution, all while keeping casualties to a minimum.
The first mention of Drezzi occurred in The Old Republic: Revan, a novel penned by Drew Karpyshyn. The StarWars.com Online Companion for the 2009 reference work, The Essential Atlas, situated the Drezzi system, and therefore Drezzi itself, in grid square Q-5.