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From Warhammer 40k - Lexicanum
m
→Union with the Imperium
===Union with the Imperium===
After the Emperor formed the [[Imperium of Man]], he engendered support with the Martian Mechanicum, an already existing empire. On Mars, he was commonly seen as the [[Omnissiah]], the earthly representative of the Machine God. As the Mechanicum put down a small rebellion by senior tech-priests, the Fabricator-General of Mars and the Emperor signed the Treaty of Mars, allying the two empires, guaranteeing the sovereignty of each, in . In return for supplying the Imperium with war machines and servicing the technology of the Imperium, any and all STC technology found by the Imperium would be donated to the Mechanicum.
During the [[Horus Heresy]], the Mechanicum split, with some Forgeworlds betraying the Emperor, some retaining their loyalty to the Imperium and some seceding altogether to remain neutral during the conflict. The Fabricator-General at the time, [[Kelbor-Hal]], sided with Horus during the conflict but was killed in the ensuing conflict.