The Imperium of Man is a fictional galactic empire that contains the vast majority of humanity, set in the Warhammer 40,000 universe created by Games Workshop.
However, when the warpstorms of the Age of Strife subsided, the Emperor set forth to unite mankind under his rule, turning his hordes of techno-barbaric warriors into the first superhuman Space Marines.
After having secured the scientific posts and spacedocks of Luna, along with the factories and weaponshops based on Mars, the Emperor built a warfleet with which he undertook the Great Crusade, which lasted for two centuries and ended with the formal establishment of Imperial Rule over all but the most scattered and distant human colonized worlds.
During this period, the Emperor employed his most potent soldiers, the Space Marines, and their born leaders, the Primarch. These, coupled with the combined might of the Imperial Army/Navy (later the Imperial Guard and the Imperial Navy as separate organizations), made Mankind the preeminent force to contend with in the galaxy, as its teeming numbers fulfilled what many saw as Man's destiny to rule the galaxy.
Initially the Imperium was a secular absolute monarchy headed by the Emperor. After the Horus Heresy but before the founding of the Ecclesiarchy, the Imperium was able to survive and function well against all its threats as a feudal realm headed by the High Lords of Terra and protected by the Inquisition. Witch Hunters gives a detailed history of the Imperium, starting with the realm that the Emperor himself created, to the founding of the Ecclesiarchy 3000 years after his death, and the resulting change of the Imperium from a relatively secular institution to a theocracy in which men's rights, freedoms, and even personal happiness became seen as sins, and only suffering and death for the Emperor were now recognized as virtues. Even within the Ecclesiarchy itself, attempts at reform (though only successful in the short term) have been made. Most notable of these was the Age of Apostasy, in which a radical preacher named Sebastian Thor led a revolutionary movement that eventually reached Terra itself and then proceeded to lay siege to the Imperial palace. Several Space Marine Chapters, including the Ultramarines, Dark Angels, and Space Wolves, sided with Sebastian Thor during this revolt. The civil war was finally ended when Goge Vandire, Ecclesiarch and Lord of the Administratum, was turned on and killed by his own bodyguard, the Sisters of Battle. After these events, Sebastian Thor was proclaimed Ecclesiarch, and he attempted to institute a series of reforms to improve the condition of the Imperium's way of life. However, these reforms did not survive long after his eventual death, and the Imperium quickly sank back to its former societal lows, with the Ecclesiarchy again becoming an institution dedicated entirely to the abuse of power against its own followers.
Ultimately, the High Lords are in control of the entire Imperium, and are responsible for maintaining the functioning of the Imperium through the Adeptus Terra and the Imperial Commanders. In practice, given the galactic size of the Imperium, a lot of the outlying regions are left to fend for themselves without any direct involvement of the central government.
While most of the Imperium is dystopian, the empire is so massive and sprawling that it includes countless different worlds, ranging from neolithic jungles to polluted ecumenopolises (Warhammer 92-3). For example Gudrun, a world mentioned in the Eisenhorn Trilogy by Dan Abnett, is similar to an idyllic 18th century Merry England, with stately manors controlling vast estates of rolling green hills studded with small villages, while Catachan is a hellish Death World filled with carnivorous plants (see Planets of Warhammer 40,000).
It is worth noting that the Ecclesiarchy did not exist formally until about 3000 years after the Emperor's incarceration in the Golden Throne. Prior to this it was simply the largest and strongest of the various Emperor-cults in the Imperium, which eventually grew to absorb or destroy competing cults. Once several High Lords of Terra converted and joined this cult, it was only a matter of time before it came recognized, adopted, and eventually declared the state religion of the Imperium.
The Adeptus Mechanicus, the Tech-Priests of Mars, are the engineers and technicians of the Imperium, and create most of the Imperium's more advanced machinery and weaponry, build and maintain the Titan Legions and so on. They are in effect a political entity by themselves, containing their own hierarchy of laws and armies.
Prior to the founding of the Imperium, the tech-priests were an independent entity unto themselves, and had already settled various worlds throughout the galaxy with seed worlds of their own planned Empire. Their alliance with the Emperor was Dictated by their own religious doctrines in which the Emperor occupies a messianic position of authority.
Independent of the rest of the Adeptus Terra are the Holy Orders of the Emperor's Inquisition. They are the ultimate judicial and police authority in the Imperium, second only to the Emperor himself.
An inconspicuous but vital part of the Imperial machinery of war, the Officio Assassinorum trains and deploys assassins all over the galaxy, to seek out and exterminate dangerous individuals. The deployment of one of their operatives must be sanctioned by the High Lords of Terra. In times of war (which is constant), assassins are typically deployed under the watchful eye and nominal command of an Inquisitor.
An Imperial Commander is the Imperially instituted ruler of a world. However, because of the distances involved and the unstable nature of Warp communication, Commanders generally operate very autonomously. This allows quite a lot of variation in the governments of Imperial worlds. Many governorships are hereditary (examples of this include Segmentum Commanders of Segmentum Tempestus and the royals of Volpone), but it is also possible for a planet to have an elected Commander (such as the Electors of Tanith), a tyrant Commander who rules by force of arms, or anything in between. So long as the Commander fulfills his duties to the Imperium, his rule will generally go unquestioned by central authorities.
A rare few Commanders preside over feral or medieval worlds where the Imperium has not seen fit to introduce modern technology. These Commanders usually remain distant on orbital installations, only occasionally visiting the planet to control mutation and heresy, as well as collect the modest tithes these planets pay.
The Imperial duties of a Commander include paying the planetary tithe to the Administratum, controlling mutation, insurrections and heresy on his world and maintaining a planetary defence force capable of defending the planet in the event of invasion. The Planetary Defence Forces (abbreviated to PDF) should be able to halt attacks from most foes, or at least hold out until reinforcements arrive, which could take a period of months or even years.
A relatively small number of Imperial worlds are not ruled by a Commander, but are overseen by an alternate organisation such as the Adeptus Terra, Imperial Guard or Space Marines. These include the Forge Worlds of the Adeptus Mechanicus, whose inhabitants toil without pause to manufacture the weapons of the Emperor's armies (including Mars, Gryphonne IV, Esteban VII, Lucius, Ryza, Triplex Phall and Fortis Binary), the Cardinal worlds of the Ecclesiarchy, which are given entirely over to education and worship of the God-Emperor (Ignatius Cardinal, Ophelia VII), fortress worlds of the Imperial Guard (Cadia), and the Space Marine homeworlds (Fenris, Rynn's World, Macragge, Baal, Prometheus, Caliban, Medusa).
The Imperium's defence forces consist of the:
The psychic blank Sisters of Silence, are present in the Horus Heresy collectible card game.
The Adeptus Mechanicus also contribute to the defense of the Imperium
Together, these help defend the Imperium from various enemies, which include:
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It uses material from the
"Imperium (Warhammer 40,000)".
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