

In addition to the great honour won by the Chapter in that titanic struggle, the Ultramarines gained invaluable experience in fighting these vile xenos, which they have passed on, often via service in the Deathwatch, to many other Chapters. At the Chapter homeworld of Macragge, one of the largest battles seen in centuries was fought, with the Ultramarines, led by their Master Marneus Calgar, at the very forefront. When Hive Fleet Behemoth struck the Eastern Fringe, it was the Ultramarines Chapter that turned the tide, even at the cost of the Chapter's entire 1 st Company. Often, the presence of even a small number of Ultramarines units in a larger military undertaking will ensure the participation of many more Chapters, so highly are the sons of Roboute Guilliman held in their brothers' esteem. This shared inheritance often ensures that when the Ultramarines go to war, they are supported by many other Chapters, and that when Space Marine commanders gather to consider common strategy, the counsel of the Ultramarines is greatly valued. The gene-seed from which the original Ultramarines Legion was founded is considered the purest, and it is estimated that some two-thirds of Chapters across the galaxy share their inheritance, being either direct successors or created from tithed Ultramarines genetic material. Across the domains of the Emperor, the Ultramarines are celebrated as heroic, virtuous, and noble defenders of Humanity, their deeds recorded in devotional works the length and breadth of the galaxy.Įven amongst the Space Marine Chapters themselves, the Ultramarines occupy a position of special honour. The Ultramarines and their many Successor Chapters have stood at the very forefront of the war against the Traitor, the alien, and the fiend since the very foundation of the Imperium. Of all the thousand and more 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 Adeptus Astartes stands for. The Ultramarines directly rule the sub-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.
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 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 Ultramarines were originally the XIII th Space Marine Legion before the reforms that initiated the Second Founding and reshaped the Imperium after the Heresy on the orders of Guilliman himself as the lord commander of the Imperium and Imperial Regent. 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 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.
