Okay so, this is a work in progress and i'll update it with fresh blocks of text when ready.
The year is 9999. The turn of the millennium. The galaxy has been successfully colonized by several human factions. The largest of which is the Empire of Syrrinan, comprising of five houses. Carslile, Warros, Beyn, Eidil, and Marrin. Eidil, for over three thousand years, has vied for independence. Having made their own local government, the People's Republic, they finally decide enough is enough of Emperor Sethan III.
Year 10000, the Eidilians attack, breaking away in a violent revolution and fighting the Syrrinans in a bloody onslaught which claims the lives of millions. Things go well in the beginning, Eidil gaining ground quickly and their defeats few. However, at the Battle of Nightfall, things turn sour. The Eidilian Armada is brutally shattered and their forces routed, the Syrrinians march to the capitol, Earth, or Nexus, and firebomb it to virtually nothing. A quarter of the population survives.
Year 10020, Eidil rebuilds and a violent civil war sweeps through the country, tearing it asunder again, and the fascist Congress Kingdom of Eidil emerges under the leadership of King Xarl XVI. The Eidilians immediately form a pact with other fascist nations, the recently conquered Democratic Socialist Republic of Agrippa fights it's way out of Syrrinan, but a fascist revolt turns it black. Tredia, to the south of Eidil, is also fascist and so is the house of Sahjik. With these nations, Eidil forms the Jagharta Pact. The alliance is a powerful one, and they declare war on Syrrinan. In this war, the capitol of Greenstone is besieged and conquered, Emperor Sethan III is murdered by Eidil Legions, their premier fighting force. The power shifts from Marrin to Warros, and Emperor Manuel II is crowned; whom has strong Eidilian sympathies as a wave of Fascism grips his house (sponsored by Eidil).
Now of this, we could have it set under Eidil occupation, or within Syrrinan. It all depends on what the devs want.