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During the [[Great Crusade]], the [[Emperor of Mankind]] led a force including the [[Emperor's Children]] and [[Luna Wolves]] [[primarch]]s, [[Fulgrim]] and [[Horus]], to the planet. The inhabitants of Altaneum refused to recognize the Emperor as their master and fought against compliance, eventually melting the polar ice caps to drown their world and deny it to the [[Imperium]].{{Fn|1}}.

Fulgrim would later relate the fate of Altaneum to [[Solomon Demeter]] on the surface of Twenty-Eight-Four and that the Emperor had told him and Horus not to make such a mistake again, because a wasteland of a galaxy would be a worthless prize.{{Fn|1}}.