Eventually, the Men of Iron turned on their Human masters, believing themselves superior to the Humans who relied on the Men of Iron to do virtually everything for them. The Men of Iron were developed after the similar artificially intelligent constructs remembered only as the ' Men of Stone,' but before the development of servitors or the present bio-mechanical conception of robots as used by the Legio Cybernetica. Until shortly before the start of the Age of Strife in the 25th Millennium AD, the Men of Iron were loyal only to Mankind, and served as Humanity's army and labour force in the period when much of Human space was united by an interstellar government that existed before the birth of the Imperium of Man thousands of standard years later. In the cryptic account of the history of Mankind given by Cripias, one of the keepers of the Library Sanctus of Terra, the Men of Iron or Iron Men were legendary, artificially intelligent humanoid thinking machines created by Humans during the Age of Technology. The Imperial Robot and secret Man of Iron UR-025.
