Promencius Four, a relatively unimportant colonial world, was located in the Tion Hegemony region of the Outer Rim Territories; encountering a sanitation station there was an uncommon sight. During 3 ABY, First Sergeant Hazram Namir of the Rebel Alliance was questioned by Everi Chalis, the previous Imperial governor, about his origins. Chalis inquired if Namir hailed from a remote Tionese location like Promencius Four or perhaps Khuteb, deducing this from his dialect. Namir verified his Tionese planetary origin, and Chalis subsequently discovered that his home world was actually Crucival.
The 2015 canon novel titled Battlefront: Twilight Company, penned by Alexander Freed, included a reference to Promencius Four.