An Iterator was an Imperial rhetorician, propagandist and educator who was a part of the Imperial Corps of Iterators created by the Emperor of Mankind to accompany every Expeditionary Fleet of the Great Crusade during the late 30th and early 31st Millennia. The Corps of Iterators were created by the Emperor specifically to spread and reinforce the atheistic and rationalist Imperial Truth among all the worlds conquered during the Great Crusade and brought into Imperial Compliance. Iterators were present on every Imperial world where they served as educators and propagandists who sought to insinuate the Imperial Truth into every aspect of human life. Iterators paid particular attention to the eradication of any religious or superstitious beliefs among the populace, replacing them with calm,