What Is the Horus Heresy?
The Horus Heresy was a massive civil war within the Imperium of Man that occurred in the 31st millennium. It began when the Warmaster Horus rebelled against the Emperor of Mankind after falling under the influence of Chaos. The conflict divided the Space Marine Legions and nearly destroyed the Imperium.
QUICK FACTS
| Item | Detail |
|---|---|
| Event | Galactic civil war |
| Era | 31st Millennium |
| Leader of Rebellion | Horus |
| Loyalist Leader | Emperor of Mankind |
| Outcome | Horus defeated, Imperium weakened |
EXPLANATION
The Horus Heresy began when Horus, the Emperor’s most trusted general, was corrupted by Chaos and led a rebellion against the Imperium. Several Space Marine Legions joined the traitor forces while others remained loyal to the Emperor. The war spread across the galaxy and resulted in enormous destruction. The conflict ultimately culminated in the Siege of Terra, where Horus and the Emperor fought in a final confrontation.
WHY IT MATTERS
The Horus Heresy permanently changed the structure of the Imperium. The Emperor was critically wounded and placed on the Golden Throne, while the Space Marine Legions were divided into smaller Chapters. The war also allowed Chaos to establish a permanent presence in the galaxy.
RELATED LORE
What Was the Siege of Terra
Who Is the Emperor of Mankind
What Is the Great Crusade
What Is the Codex Astartes
Who Fought in the Horus Heresy
How Long Did the Horus Heresy Last
Why Did Horus Betray the Emperor
What Happened to the Traitor Legions After the Heresy
FAQ
Why did Horus rebel against the Emperor?
Horus was corrupted by Chaos and manipulated into believing the Emperor had betrayed humanity.
How long did the Horus Heresy last?
The conflict lasted several years and affected much of the Imperium.
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