Crimson Fists - Foundation and Crusades: In the aftermath of the tragic conflict known as the Horus Heresy, Roboute Guilliman, the primarch of the Ultramarines Legion, penned his sacred manual of warfare, the Codex Astartes. With the creation of this tome, Guilliman demanded that his brothers accept his example by dividing their own Space Marine Legions into 1,000-member Space Marine Chapters so that no single commander could ever control the power of an entire Astartes Legion again.Initially, Primarch Rogal Dorn of the Imperial Fists Legion was opposed to such a notion. He argued that more than ever before, it was crucial for his Space Marines to remain as a consolidated Legion so that they could continue to work closely together in order to protect the Imperium from the remnants of the Traitor Legions.This issue became an increasingly critical point of contention between the two primarchs, as their arguments grew in intensity. Ultimately, following the events known as the Iron Cage, Dorn eventually relented, choosing to concede to Guilliman's demands and allow the surviving Astartes of his Legion to be divided into three Chapters. Two of the Chapters formed from the Imperial Fists Legion were the Black Templars and the Crimson Fists.The Crimson Fists Chapter's members were selected by Dorn from those Astartes who had been most recently initiated into the VII Legion, with the exception of its leaders, who were all Veterans. The newly founded Chapter's first Chapter Master was Alexis Polux, a battle-brother who had won the primarch's respect countless times.Known as much for his massive physical size and prowess as his leadership and tactical expertise, Polux led the Crimson Fists for the first 800 standard years of their existence. During this time, he did much to shape their interpretation of the Codex Astartes and their combat doctrines.The Crimson Fists were a crusading fleet-based Chapter for the next nine Terran millennia much like their brother Chapter the Black Templars. The Crimson Fists travelled throughout the Imperium, defeating the enemies of the Emperor. Their Battle Barge Rutilus Tyrannus served as their mobile fortress-monastery, though a large fleet of additional Strike Cruisers supported it.Across the ages, the Crimson Fists built a reputation of loyal service and utter competency in the fight against any who would oppose the Imperium of Man. Much of their activity was focused within the Loki Sector of the Segmentum Tempestus, but this was not the only region of the galaxy in which they defended the realm of the Emperor.No matter the nature of the foe, this Chapter remained loyal to the Imperium and its sacred cause, answering the calls of both the Inquisition and the Adeptus Administratum throughout its long service. Its service has led to that trust being reciprocal, to the extent that twice the Chapter has been assigned to eliminate other Space Marine Chapters that have embraced heresy. These were the Sons of Gideon, who surrendered to madness, and the Marines Vigilant, whose minds were shattered by xenos exposure.Perhaps their most famous Crusade was the Crusade of Righteous Liberation fought for 300 Terran years during the 36th Millennium that nearly destroyed the Chapter, leaving only 128 Crimson Fists Astartes remaining before it was completed. Unlike the Black Templars, the Crimson Fists showed a more rigid adherence to the Codex Astartes, and tended to maintain close ties with the worlds of the Loki Sector. It was not until almost eight hundred standard years into the 40th Millennium that the Crimson Fists were granted feudal rights to their own Chapter planet, Rynn's World, which was located in the Loki Sector.The world was granted to the Chapter as a reward by the High Lords of Terra for its success in the Voltigern Crusade. Over the course of this Crusade, the Crimson Fists had blunted countless significant Ork forces within the sector, preventing them from unifying into a single overwhelming threat. The proximity of Rynn's World to several of the Crimson Fists' primary recruiting worlds like Blackwater in that sector was ideal, and the Chapter constructed its fortress-monastery, the Arx Tyrannus, from the dismantled remains of their ancient Battle Barge Rutilus Tyrannus in the middle of the inhospitable and frigid Hellblade Mountains of the planet's southern continent.