Ultramarines

Of all the Space Marine chapters, it is the blue-clad Ultramarines that, in the mind of the countless billions of the Emperor's subjects, personify everything that the Space Marines stand for. They are the noble defenders of Humanity, the heroes of countless wars and celebrated in devotional works the length and breath of the galaxy.

Their gene-seed is deemed the purest of all the original legions and so most of the subsequent foundings used their gene-seed and therefore share their inheritance.

Their Primarch was Roboute Guilliman who wrote the Codex Astartes after the Horus Heresy and convinced his brother Primarchs to split the legions into Chapters. And the Ultramarines to this day revere the Codex as a holy text and their strict adherence to it, is maybe the only thing they sometimes can be fault for.

Their home is the realm of Ultramar and their chapter monastary stands on Macragge.

The Ultramarines have supported the Deathwatch ever since its founding, but since the Tyranid invasion on Ultramar they have tried to send even more brothers to hone their skills against the xenos foe.