TheImperium of Manis agalaxy-spanning interstellarhumanempire, the ultimate authority for the majority of the human race in theMilky Way Galaxyin the late 41st Millennium A.D. It is ruled by the living god who is known as theEmperor of Mankind.
However, there are other humanoid species classified as Imperial citizens, mainlymutantoffshoots of genetic base-line humans who are known asAbhumansand include such human sub-races as theOgryns,RatlingsandSquats.
The founder and ruler of the Imperium is the god-like Emperor of Mankind, the most powerful humanpsykerever born. The Emperor founded the Imperium over 10,000 Terran years ago in the late 30th Millennium during theUnification Warson Old Earth following the terrible period in human history known as theAge of Strife.
The Emperor continues, at least nominally, to rule the Imperium as both its political master and its primary religious figure. However, His badly damaged body is interred within the cybernetic life support mechanisms of the arcane device known as theGolden Thronefollowing His mortal wounding during the ancient interstellar civil war of theHorus Heresy.
Because of this terrible fate, the Emperor is incapable of interacting with others on a day-to-day basis and has left the basic governance of His Imperium to theSenatorum Imperialis, an oligarchic ruling council of the most powerfulnoblelords and Adepts in the galaxy. The Senatorum Imperialis is currently led by the Emperor's genetic son, thePrimarchRoboute Guilliman, who chairs the council and directs Imperial policy as theLord Commander of the Imperium.
The Imperium of Man is a war-torn stellar empire, teetering on the brink of collapse. For 10,000 Terran years it has been ruled by the deathless Emperor, a being of almost limitlesspsychicpower, to whom thousands of souls are sacrificed daily.