Chronostrife

The Chronostrife is a bitter, ongoing internal war within the Ordo Chronos over the Imperium's dating system by first century of the 42nd Millennium. Sometime after his resurrection in 999.M41, Roboute Guilliman, the acting Lord Commander of the Imperium and Primarch of the Ultramarines Chapter, was intent on making a full and accurate accounting of the Imperium of Man's fragmentary and often contradictory history, the truth of which would inevitably help humanity's advancement out of the darkness that had befallen it in the millennia after the Horus Heresy. For this task, Guilliman formed the small Imperial organisation known as the Logos Historica Verita, which utilised individuals of an inquisitive and more liberal nature, and after training them personally in objective methods of data collection, assigned them the daunting task of discovering, collating and cataloging thousands of standard years of human history that had been lost or was woefully inaccurate due to superstition, suppression or purposeful obfuscation by the High Lords of Terra.

But the monumental task he had set before them was made all the more daunting when the Primarch discovered that even his father's calendar had survived the millennia intact. During the Great Crusade and the Horus Heresy, the standard Imperial Dating System had provided some idea of the order of events over time, but like everything else the Emperor had created, the calendar had become degraded by both dogmatic adherence and thoughtless revisionism. Various rival dating systems had evolved from the Imperial Standard, making a true chronicle of the galaxy almost impossible to construct. As the Indomitus Crusade drew sometime around 111.M42, Guilliman calculated the current year by the five main factional variants of the Imperial Calendar to be anywhere between the early 41st Millennium and an entire millennium later, and that was leaving out the numerous lesser, more heretical interpretations. Guilliman had been hoping to find a solution to the Imperium's tortured dating system; he had instead found there was none. It was something else that would ultimately require his personal attention to repair.