Where the Space Marine Legions had once served as the Imperium's primary frontline military forces, that role was given over to the newly created Astra Militarum, which had been created from the remains of the Imperial Army in the wake of the Heresy. Newly formed Chapters created at this time that were carved out of the remaining 9 Loyalist Legions became known as Successor Chapters.Īs a result of this change in organisation, the Space Marines' military purpose changed as well. At the time of the outbreak of the Horus Heresy in the early 31st Millennium, the Ultramarines Legion was divided into twenty Chapters, each composed of ten companies, with each company composed of roughly one thousand Astartes.įollowing the end of the Heresy, Guilliman, as the new Lord Commander of the Imperium, ordered during the event known as the Second Founding that the remaining Loyalist Space Marine Legions be divided and re-organized into smaller one-thousand Astartes Chapters, to ensure that no future rebel such as Horus could gain control of such a large and power military unit as a Space Marine Legion again. These Chapters (alternatively designated as Great Companies, Harrows, Millennials, etc., depending on each Legion's particular culture) were originally composed of roughly 1,000 line Legionaries, but as the Legions grew, this number began to vary substantially by Legion, and also through the vicissitudes of war and the availability of replacement recruits. This form of organisation was also adopted by many of the other Legions of comparable size. The Ultramarines became so large, growing to a size that included over 100,000 Astartes, that a new, larger unit of division, the Chapter, was created to better organise the XIII Legion's forces. The XIII Legion, the Ultramarines, led by Roboute Guilliman, became the largest of all the Astartes Legions as a result of Guilliman's tactical mastery and a steady flow of new recruits from the Realm of Ultramar as well as the terrible losses suffered by other Legions such as the Dark Angels during the Rangdan Xenocides. 4 Post-Ultima Founding Chapter Organisationĭuring the Great Crusade in the late 30th Millennium, the Space Marines were originally organised into 20 Legions each of which was further divided into companies.
It is believed that there are about 1,000 Chapters of Space Marines operating throughout the galaxy at any one time, though this number can fluctuate greatly as time and circumstances determine. The Codex has been adopted by the vast majority of Space Marine Chapters as their organisational blueprint.Ĭonsequently, most Space Marine Chapters are considered " Codex Chapters" or " Codex-compliant Chapters" due to their adherence to the Codex Astartes. The Codex Astartes details the proper organisational structure and mobilisation methods for a Space Marine Chapter. The majority of Space Marine Chapters follow the dictates of the Codex Astartes, a sacred tome written by the Ultramarines Primarch Roboute Guilliman. Most Chapters have feudal title to an entire planet of the Imperium which serves as its Chapter homeworld or to a large fleet of powerful and massive starships that serves as a mobile headquarters if the Chapter is fleet-based. Every Chapter is entirely autonomous from every other Adepta of the Imperium, including the Inquisition, and takes its orders only from the High Lords of Terra themselves. Each Chapter serves collectively with the others of its kind as part of the Imperium of Man's Adeptus Astartes. The Ultramarines, the archetypal Codex Astartes-compliant Space Marine Chapter, gathered for war.Ī Chapter is a completely autonomous military unit made up of one thousand of the superhuman warriors known as Space Marines or Astartes and their related vehicles, starships and support personnel. High Lord Tagus, Convenor of the 349th Congress of the Imperium In Japan, they are published in Shuukan Shounen Sunday (Shogakukan)." Such is the woe cast upon the Domains of the God-Emperor of Mankind in these times that in their wisdom and beneficience, the High Lords of Terra have this day issued this decree: Let there be a Founding of the Adeptus Astartes, and let the foes of the Emperor know that this galaxy belongs to Him, now and forever." The chapters of the manga of Tonikaku kawaii (aka Tonikaku Cawaii, fly me to the moon) are written and illustrated by Kenjiro Hata.
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