The Blades of Dorn are a proud Chapter descended from Imperial Fists lineage, created as a part of the 12th Founding during the tumultuous centuries of the Nova Terra Interregnum during the 35th Millennium. This was a period of extreme unrest and civil strife, when the Imperium of Man had been split in twain. The Ur-Council of Nova Terra no longer recognised the rule of the High Lords of Terra and had seceded from the Imperium of Man, forming their own empire in the Segmentum Pacifiucs. This period of divided rule would last for nine standard centuries.