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{{UltramarinesPortal}}

'''Marius Gage''' was [[Chapter Master|Master]] of the [[1st Chapter (Ultramarines Legion)|First Chapter]] of the [[Ultramarines]] [[Space Marine Legion|Legion]] (First Master of the Ultramarines) during the [[Great Crusade]] and the [[Horus Heresy]] and second-in-command to [[Roboute Guilliman]].{{Fn|1a}}

==Biography==

A [[Terra]]n [[Space Marines|Marine]], Gage was one of the original recruits to the XIII Legion.{{Fn|1b}} Gage was appointed as [[Lord Commander]] of his legion after the death of [[Gren Vosotho]] in the [[Osiris Rebellion]], but became second in command following the rediscovery of [[Roboute Guilliman]], holding the title of '''Chapter Master Primus'''.{{Fn|3}}{{Fn|5}}