The complexities of the Legion's past and the sometimes divisive and even antagonistic relationship the Ultramarines had with several of their fellow Legions was also concealed.It would be this hidden history that was to bear bitter fruit on Calth and cast its shadow on the wars that were to follow.The XIII Legion's "Alpha" intake -- the test bed raising of several thousand warriors by which its gene-seed's stability and adaptability was judged -- was passed firmly within acceptable parameters and with no singular or notable physical mutation beyond the expected pattern, with fully functionality of implanted organs to projected specifications.
Although much of what would then transpire for the XIII Legion's very early expansion past its test stage has been occluded by layers of the unbreachable secrecy inherent in much of the Emperor's gene-work, and records lost in the destruction caused on Terra during the great siege during the Battle of Terra, certain facts can still be pieced together and a hypothesis formed.
In terms of recruitment, evidence is apparent for a net being cast across Terra for initiates for the XIII, with intake from areas as diverse as the sub-equatorial maglev clans of Panpocro, the war families of the Saragon Enclave, the proud Midafrik Hive Oligarchy and, most latterly, the anthropophagic tribes of the Caucasus Wastes.
As varied in culture and origin as these groups were, they all had one factor in common; their violent and often bitter resistance to the later stages of Unification, a resistance broken ultimately in each case not by negotiated surrender but near annihilation, with, in some situations, little remaining save interned refugees and orphaned populations left by the savage conflicts which had brought these peoples to heel.
It was this which led to the first informal cognomen by which the XIII Legion's gene-seed may have been used deliberately as a final weapon of the Unification to bleed away potential rebellion on Terra, and also further absorb the strength of the savage tribes of Old Night into the fledging Imperium.
Angels Revenant, Aurora, Black Consuls, Brotherhood of a Thousand, Crimson Consuls (Destroyed), Desert Lions, Doom Eagles, Doom Legion, Eagle Warriors, Fire Angels, Fire Hawks (Suspected-Destroyed), Genesis Chapter, Hawk Lords, Heralds of Ultramar, Howling Griffons, Imperius Reavers, Inceptors, Iron Snakes (Suspected), Libators, Marines Errant, Metamarines, Mortifactors, Nemesis, Novamarines, Obsidian Glaives, Patriarchs of Ulixis, Praetors of Orpheus, Red Consuls, Scythes of the Emperor, Silver Eagles, Silver Skulls (Suspected), Sons of Guilliman, Sons of Orar, White Consuls The Ultramarines are considered one of the strongest and most honoured of all the Space Marine Chapters in the Imperium of Man, and were responsible for almost single-handedly holding the Imperium together after the Horus Heresy.
Highly disciplined and courageous warriors, the Ultramarines have remained true to the teachings of their Primarch Roboute Guilliman for 10,000 standard years.The Ultramarines were originally the XIII Space Marine Legion before the reforms that initiated the Second Founding and reshaped the Imperium after the Heresy on the orders of Guilliman himself.The name "Ultramarines" is a nod to both the Chapter's standing amongst the other Space Marine Chapters and their role as the source for the gene-seed of more Chapters of Astartes than any of the other former First Founding Legions combined.The culture of the Ultramarines is loosely themed upon the culture of Old Earth's ancient Roman Empire, as exemplified in their Astartes' pseudo-Latin names and their strict adherence to the Codex Astartes, as well as the society of their homeworld of Macragge and the Chapter's method of recruitment.The Ultramarines directly rule the sector of space in the Eastern Fringe known as Ultramar as a fief of the Imperium and their Chapter Master is also considered the Lord of Macragge and the Master of Ultramar.Legion, the Ultramarines, stood as one of the single, most powerful military forces in the Imperium.