Hedgehobbit gave me the idea for this topic.

What i want here isnīt as much a history of Warhammer 40Ks fluff as it is now, but more its evolution through the different editions.

An example from what iīve heard Chaos wasnīt even present in the very first W40k edition Rouge trader. It wasnīt before later it was added.

Same with the Primarchs in the game Chaos Gate they are just refereed to as space marine lords, so when was that bit changed into primarchs? And so forth.

So hopefully through this threat we can give a clear picture of when and with what edition, the different races was added and how their fluff changed over time.