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From Warhammer 40k - Lexicanum
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→History: his exact word was "rebel" as opposed to "traitor"
The Codex Astartes was a code developed by Guilliman. This tome would contain everything a member of the Astartes would need to know to function. From recruitment to organization to tactics and beyond the Codex Astartes became a sacred text to the majority of the Chapters.{{Fn|10}} One of the most significant changes under the new Codex was the newly founded Chapters. Where the Legions could number more than 10,000 strong the Chapters would be limited to about a thousand. Each original Legion would be divided as many times as needed into successor Chapters. This division would come to be called the [[Second Founding]] seven years after the Horus Heresy{{Fn|11b}}, in 021.[[M31]]. The remaining thousand bodies in the original Legion would also survive as a new Chapter of the same name. While these newly created Chapters claimed their founders origins, such as their Primarch, they would also come to develop their own culture and customs.{{Cite This}}
[[Rogal Dorn]] initially rejected the Codex Astartes and enmity developed between him and Guilliman. Dorn called Guilliman a coward, citing his lack of participation in the defense of the [[Imperial Palace]]. Guilliman accused Dorn of being a traitor rebel for refusing the Codex. This enmity quickly involved other Space Marine Legions and a rift developed, [[Leman Russ (primarch)|Leman Russ]] of the [[Space Wolves]] stood by the [[Imperial Fists]], while [[Jaghatai Khan]] of the [[White Scars]] and [[Corax]] of the [[Raven Guard]] supported the [[Ultramarines]]. A second civil war appeared likely when the Imperial Fists strike cruiser ''Terrible Angel'' was fired upon by the [[Imperial Navy]] in connection with Codex crisis.{{Fn|7}}
However, Dorn ultimately relented after spending seven days meditating in the [[pain glove]]. There, he concluded that the Legion could no longer serve the Emperor who had been and must serve the Emperor who was, which involved accepting the new order of which the Codex was a part.{{Fn|8}}
