Aldus Prime was a planet orbiting the star Ross 614 in the galaxy's Beta Quadrant. (ST reference: Star Charts)
In the Mirror Universe, Aldus Prime was a stronghold of the rebellion against the Terran Empire. In 2155, Empress Sato I was brought to Aldus Prime to stand trial for the crimes of the empire before judges T'Pau, Gral, Navaar and Trev. (ENT novel: Age of the Empress)