The Sphere of Imperial Intelligence was one of the twelve original spheres of influence. Historically, it oversaw various analytical and espionage departments, particularly the semi-autonomous Imperial Intelligence agency. The agency was led by a minister, who reported directly to the councilor that occupied the sphere.
Darth Jadus was the head of the Sphere before his faked death. Upon his disappearance, he was removed from its head and replaced by his daughter and apprentice, Darth Zhorrid.
In the aftermath of the Star Cabal Crisis, Imperial Intelligence virtually fell apart. Along with the assistance of the Dark Council and Cipher Nine, Darth Zhorrid reorganized the crumbling organization into Sith Intelligence, which, unlike its predecessor, was controlled by Zhorrid directly, as opposed to being an independent ministry.
After the Empire's defeat at the hand of the Eternal Empire, the sphere was combined with the Sphere of Expansion and Diplomacy into the Sphere of Galactic Influence by Empress Darth Acina.