Ultramarines - Son of Macragge: Thanks to the widely distributed efforts of numerous Imperial Iterators, the story of Primarch Roboute Guilliman, his early life and his finding is widely known and well-accounted for, in stark contrast to certain others of the primarchs. Much of these accounts have of course served the role of edification for the masses and the demands of Imperial propaganda over the millennia, but between the accounts, variously embellished, a number of consistent facts and themes emerge.According to Imperial legend, the Emperor of Mankind created the primarchs from artificially-engineered genes using His own genome as part of the original template, carefully imbuing each of them with unique, superhuman powers. Imperial doctrine goes on to tell how the Ruinous Powers of Chaos spirited away the primarchs within their gestation capsules, scattering them widely across the galaxy through the Warp.More than one of the capsules was breached whilst it drifted through Warpspace -- the forces of the Immaterium leaked in, wreaking havoc on the gestating being inside the capsule. Undoubtedly damage was done and Chaos corruption affected several of the primarchs, although the nature of that corruption would not become apparent until the Horus Heresy.After drifting for solar decades, or in some cases even hundreds of Terran years, the twenty gestation capsules came to rest on Human-settled worlds throughout the Milky Way Galaxy -- distant planets inhabited by a variety of Human cultures, and whether by fickle fate or cruel design, each world would provide a crucible which would temper the superhuman child into the primarch they would become, be that hero or monster, tyrant or liberator.The capsule containing the developing form of one primarch fell upon the world of Macragge in the Eastern Fringe of the galaxy. Macragge was a bleak but not inhospitable world, part of a decayed star empire of ages past that Mankind had inhabited for many standard centuries since the time of the Dark Age of Technology. Its industries had survived intact, and its people had retained an authoritarian but cohesive society.Macragge had remarkably preserved a number of antiquated short range Warp-capable craft which could be utilised for near-stellar transit -- conditions permitting -- and its people continued to build sub-light voidcraft even during the time of the most intense Warp storms during the Age of Strife. This had allowed the people of Macragge to maintain contact with several neighbouring Human-settled star systems, despite the Warp storms' fury, and so retain a tenuous link to the rest of Human space and the knowledge that it was not alone in the darkness.So it was that when the primarch's fallen capsule was discovered by a group of magnates who were on a hunt in a local forest, they knew it immediately for a device of advanced technology rather than a thing of superstition and magic. The magnates broke the capsule's seal and discovered a strikingly beautiful and perfectly formed Human child within it who was surrounded by a glowing nimbus of power. The child was brought before Konor Guilliman, one of a pair of nobles who bore the title "consul," whose authority governed the most civilised and powerful region of Macragge, and Konor adopted the infant as his own son in a manner not uncommon to his culture, naming him Roboute.The young primarch grew unnaturally quickly and as he did so, his unique physical and mental powers became obvious to all. It is recorded that by the time of his tenth birthday, Guilliman had mastered everything the wisest tutors of Macragge could teach him. His insight into matters of history, philosophy and science astonished his teachers, while his recall was absolute and his ability to extrapolate accurate conclusions from fragmentary information was said to border on the inexplicable.His greatest talent, however, lay in the art of war, which was itself treated as a high and lauded science in Macragge's culture. As soon as he had attained his legal majority, Roboute's foster-father Konor Guilliman immediately granted him command over an expeditionary force sent to pacify the far northern lands of Macragge.Named Illyrium, it was a barbarous land of outcasts and petty, warring micro-states that had long harboured brigands and mercenaries who raided more civilised lands as often as they hired themselves as foot soldiers to fight their neighbours' wars. Roboute fought a brilliant campaign and won both the submission and the respect of the fierce Illyrium warrior bands, but when he returned to his home from the northern frontier, Roboute found the capital city of Macragge Civitas in turmoil.