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Imperium of Mankind (Great Crusade Era - Warhammer 40k)

The Imperium of Mankind is an interstellar empire under which the vast majority of the human race is united. Led by the Emperor, humanity begins it's Great Crusade; the conquest of galaxy.

~~ Play as the Immortal Emperor of Man and recreate the Great Crusade. Conquer the galaxy in the name of humanity and exterminate everything alien and unattractive. FOR THE EMPEROR! ~~

This is set during the Great Crusade Era (31st Millennium), with a young Imperium being led by the Emperor himself. It makes the most sense I think, since you start in a single solar system and have to work your way out, similar to what the Emperor and his crusade fleets did.

http://warhammer40k.wikia.com/wiki/Great_Crusade