The Cult Mechanicus has ancient origins, developing on Mars during the Age of Strife. It was the state religion of the early Mechanicum even before the arrival of the Emperor and the commencement of the Great Crusade. When the Emperor first arrived on Mars many saw him as the Omnissiah, or the physical manifestation of the Machine God. As per the terms of the Treaty of Olympus that saw Terra and Mars unify, the Mechanicum was was still allowed to practice its faith despite the Emperor’s own secular Imperial Truth. The Cult Mechanicus continues to exist to this day, distinct but related to the Imperial Cult.
