The War of the False Primarch

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The War of the False Primarch was a dark and bloody episode of the Imperium's history, now largely lost to myth and purged from all records, that plunged the Segmentum Pacificus into anarchy from 780.M33 to 860.M33. The conflict was finally ended when the High Lords of Terra, conveyed the Pentarchy of Blood and tasked five loyal Chapters to destroy eleven others, that had been declared Traitoris Perdita for their actions during the war

Real Primarch Theory

There is some small evidence to suggest that the false Primarch may have actually been one of the two lost Primarchs. Namely the length of the war (the Horus Heresy lasted at most 10 years were as this war lasted 80) pointing to the war not being as one sided as it should have been otherwise, and the degree to which the records were purged seems too great for just the average war.