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'''Eidolon''' was born on [[Terra]] to European nobility during the [[Unification Wars]]. His family had ruled a mountain holdfast with armies of retainers, but in the end they were smashed by the armies of the [[Thunder Warriors]]. Eidolon had been a second-born son, and his family gave him to the [[III Legion]].{{Fn|15a}} Eidolon eventually became the first [[Astartes]] personally promoted to the rank of a [[Space Marine Captain|Company Commander]] by [[Fulgrim]], and his rise to the top of the Legion as a Lord Commander was accompanied by the growth of his reputation as a prime example of what it meant to strive to achieve perfection. He was commonly regarded within the Legion as the most proficient of the Lord Commanders, with a combat record that included excellent performance in sieges, holding actions and rapid assaults.{{Fn|1}} Eidolon looked to Fulgrim as a father-figure in a particularly intense way, and was subsequently unfailingly loyal to the [[Primarch]]. This, combined with the personality traits that come with overwhelming arrogance, led to his fall to [[Chaos]] during the [[Horus Heresy]].{{Fn|2a}}