Rogal Dorn was the Primarch of the Imperial Fists Space Marine Chapter. He was one of the twenty Primarchs created by the Emperor in the earliest days of the Imperium, just after the end of the Age of Strife.
Dorn commanded his Legion and Expeditionary Fleets with peerless devotion and military genius. It was said that he possessed perhaps the finest military mind of the Primarchs, ordered and disciplined but still inclined to flashes of zeal and inspiration. Indeed, the Warmaster had said that he esteemed Dorn and the Imperial Fists so highly that he reckoned if the Fists, noted masters of defence, were to hold a fortress against him and his Luna Wolves, the resultant conflict would result in a never-ending stalemate.