Macragge is the fortress-capital of the realm of Ultramar and the revered homeworld of the Ultramarines, among the most disciplined and storied Chapters of the Space Marines. A world of rugged mountains and cold northern wastes, it is a bastion of order in a galaxy of chaos, its cities clean and its people governed with a rare and lawful hand.
The planet is dominated by the Fortress of Hera, a colossal citadel that serves as the Chapter's monastery and the seat of its rule. From here the sons of Guilliman administer not only Macragge but the surrounding cluster of worlds, upholding the codes and institutions their primarch established after the ruinous civil war of the Horus Heresy. Statues, libraries, and halls of remembrance make the world as much a monument to civilization as a machine of war.
Macragge's history is scarred by a single catastrophic trial: the great invasion of the Tyranids, when a splinter of a devouring hive fleet fell upon the system and was halted only at terrible cost. Its northern polar fortresses still bear the wounds of that battle. Today Macragge stands as the beating heart of Ultramar, a symbol of what humanity might have been had the dream of a rational Imperium not been drowned in blood, and a rallying point for those who still believe in that lost ideal.