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In the cryptic account of the ages of Mankind given by Cripias, one of the Keepers of the Library Sanctus of Terra, the '''Men of Iron''' were legendary sentient humanoid machines created by humans during the [[Dark Age of Technology]]. Until shortly before the [[Age of Strife]], the Men of Iron were loyal only to Mankind, and served as their army. They came after the [[Men of Stone]], but before the "modern" conception of robots in the Warhammer 40k universe. Eventually, they turned on their Human masters, believing themselves superior to the Humans who relied on the Men of Iron to do virtually everything for them. In the end, the Men of Iron were destroyed by Humanity.