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First amongst the Primogenitors, the Genesis Chapter are dogmatically loyal to the memory of [[Roboute Guilliman]], and can be counted upon to fight at the Ultramarines' side without hesitation.{{Fn|1a}}{{Fn|13c}} They have the honour of being the first of the primogenitors and were formed from the noblest Ultramarines veterans who survived the Horus Heresy. Upon their inception, their first battle wrested the planet [[Newfound]] from the [[Word Bearers]].{{Fn|5}}

The Genesis Chapter is one of the closest chapters doctrinally and astrographically to the Ultramarines, often undertaking joint operations. The Genesis Chapter Space Marines also routinely fill the gaps in the Ultramarine companies if they fall below [[Codex Astartes|Codex]] strength, or fill specialist positions such as the [[Librarius]] or [[Armoury|Forge]] staff. {{Fn|3}}{{Fn|13c}} Its Space Marines commonly undertake at least one pilgrimage to the [[Shrine of the Primarch]].{{Fn|3}} The Genesis Chapter's [[Chaplain]]s regard the [[Codex Astartes]] as sacrosanct, going to great lengths to ensure that the Chapter adheres to its tenets, and any point of contention is debated thoroughly with recourse to the opinions of the Ultramarines' [[Chaplain]]s for final ratification in order to ensure there is no doctrinal drift between the Ultramarines and the Genesis chapter.{{Fn|3}}