Who Fought in the Horus Heresy?
The Horus Heresy was fought between loyalist and traitor forces of the Imperium of Man. The conflict involved Space Marine Legions, Primarchs, Imperial military forces, and Chaos-aligned armies. Loyalists fought to defend the Emperor, while traitors followed Horus in rebellion.
QUICK FACTS
| Item | Detail |
|---|---|
| Conflict | Horus Heresy |
| Loyalist Leader | Emperor of Mankind |
| Traitor Leader | Horus Lupercal |
| Major Forces | Space Marine Legions |
| Scale | Galaxy-wide civil war |
EXPLANATION
The Horus Heresy began when the Warmaster Horus rebelled against the Emperor and convinced several Primarchs and their Space Marine Legions to join him. Loyalist forces included Space Marine legions that remained faithful to the Emperor along with other Imperial organizations. The war spread across many star systems and involved numerous battles, eventually culminating in the Siege of Terra.
WHY IT MATTERS
The Horus Heresy reshaped the Imperium and created lasting divisions between loyalist and Chaos forces. Many of the conflicts in the modern Warhammer 40K setting stem from this civil war.
RELATED LORE
What Is the Horus Heresy
Who Betrayed the Emperor Among the Primarchs
What Was the Siege of Terra
What Happened After the Horus Heresy
FAQ
How many legions fought in the Horus Heresy?
All Space Marine legions were involved, either as loyalists or traitors.
Who led the rebellion?
Horus Lupercal served as the leader of the traitor forces.
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