|Description:||Area within the Imperium granted self-government through a charter from Empress Margaret I in 6173. The charter granted control of the region of space within a radius of 50 parsecs of Terra to a Solomani governing body, hence the name "Solomani Sphere", which was given broad powers of authority.|
For two hundred years, the Imperium effectively ignored the region and concentrated instead on its coreward frontiers.
By 6409, Solomani oppression of nonhuman (and non-Solomani) worlds forced Empress Margaret II to revoke the region's charter. After years of diplomatic actions proved fruitless, it was decided to forcibly reintegrate the region into the Imperium. Naturally, the Solomani resisted, and the Solomani Rim War (6459 to 6471) began.