How Long Did the Horus Heresy Last?

The Horus Heresy lasted approximately nine years during the early 31st millennium. It began when Horus rebelled against the Emperor and ended with the Siege of Terra. The conflict devastated the Imperium and reshaped its structure.

QUICK FACTS

EXPLANATION

The Horus Heresy began when the Warmaster Horus turned against the Emperor after being corrupted by Chaos. Several Primarchs and their legions joined the rebellion. The resulting war spread across the galaxy and included many major battles. The conflict ended when the Emperor defeated Horus during the Siege of Terra.

WHY IT MATTERS

The Horus Heresy was one of the most destructive events in human history within the Warhammer 40K universe. It led to the Emperor’s imprisonment on the Golden Throne and permanently altered the structure of the Imperium.

RELATED LORE

What Is the Horus Heresy
What Was the Siege of Terra
Who Betrayed the Emperor Among the Primarchs
What Happened After the Horus Heresy

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