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The '''Apostasy''' was one of the most destabilising events in Imperial history after the Heresy, beginning during the long struggle between the Ecclesiarchy and the Administratum for power over the Imperium. [[Goge Vandire]], the 361st [[Master of the Administratum]], was a power-hungry tyrant, eventually gaining direct control over the Ecclesiarchy by usurping the position of the Ecclesiarch. This made him the most powerful individual in the Imperium. His rule became known as '''The Reign of Blood''', consisting of massive purges of the Ecclesiarchy, and the killings and assassinations of countless perceived traitors and conspirators. This period was eventually ended by [[Sebastian Thor]]'s [[Confederation of Light]]. The Apostasy resulted in a reformation of the Ecclesiarchy, including the [[Decree Passive]] which banned the Ministorum from maintaining men under arms.Eventually, the Ecclesiarchy circumvented this by raising the [[Sisters of Battle]].{{Fn|10}}