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· Super Moderator
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Proper Chaos Marines appeared after the release of Rogue Trader (1st Ed 40K) but before the release of 2nd Ed.

There were occasional mentions of Space Marines rebelling before that, but they could also redeem themselves after they did. So the Heresy was added to the storyline later.

Current Storyline
The Emperor created Space Marine Legions to wage a grand crusade to capture the galaxy for humanity. The Emperor had other plans as well, so handed leadership of the crusade to Horus. Horus fell to Chaos, followed by the leaders of some of the other Legions. At which point some Legions joined Chaos.
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