abstract
| - With the threat of the Traitor Legions held at bay in the wake of the Great Scouring, Roboute Guilliman turned to ensuring that such a catastrophic inter-species war could never happen again, distilling his formidable wisdom into the mighty tome known as the Codex Astartes. This text became a major part of his legacy and the cornerstone upon which the future of the Adeptus Astartes would be based. No complete copies of his original text is known to exist although the majority of his tome has survived and is available to all space marines, if not committed to memory . Though for all its multitudinous topics, the most lasting and contentious decree of the Codex Astartes was that the existing Space Marine Legions be broken up and reorganised into smaller organisations known as Chapters. Though many of his brother Primarchs initially railed against Guilliman's decree, almost all eventually accepted the necessity of reorganisation for the security of the Imperium. Upon the Codex's implementation, in an event that would become known as the Second Founding, each of the old Legions became a conclave of chapters, one of which would bear the name for its forebear legion as well as heraldry, homeworld, and would retain some level of political primacy amongst its peers. The rest would take new names, heraldry, and homeworlds or fortress-monasteries, and stretch themselves across the Imperium. The Codex Astartes stated that each Chapter would be one thousand Battle-Brothers strong and look to its own recruitment, training and equipment. Never again would one man be able to command the awesome, terrifying power of a Space Marine Legion. Over the millennia, there have been many subsequent Foundings of Space Marine Chapters. Those Chapters that adhere rigidly to Guilliman's teachings are sometimes referred to as "Codex Chapters." These Space Marines pride themselves on following the tenets within the hallowed pages of the Codex Astartes and applying its principles of warcraft and devotion to the Emperor.
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