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From Warhammer 40k - Lexicanum
→Origins
==Origins==
*{{Main|Horus Heresy}}
Ten thousand years ago, [[Horus]], [[Warmaster]] of the [[Imperium]] and most trusted 'son' of the [[Emperor]], fell under mysterious circumstances to Chaos. Besides the [[Space Marine Legion]] under his direct command, the ''[[Sons of Horus]]'', eight of his brother-[[Primarch]]s and their legions also joined him in the [[Horus Heresy]] against the Emperor.
