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A [[Terran]] native from the plains of the '''Sibran region''', Astelan was a child when his land was conquered by the [[Emperor]]'s [[Thunder Warriors]], and he retained vivid memories of the massacres he saw for the rest of his life.{{Fn|4}} Astelan claimed that his people were then among the first to fight alongside the Emperor during the [[Wars of Unification]] and that it was from them that the Emperor took the first recruits for the [[Legiones Astartes]]{{Fn|5b}}; Astelan was inducted into the [[First Legion]] — then the ''only'' legion - as one of the first 5,000 [[Space Marines]].{{Fn|4}} He next comes to prominence in Imperial record as a Dark Angels Legion Chapter Master, or '''Chapter Commander'''. Little is known of his previous career, though it is believed that his advancement from [[Space Marine Sergeant|Sergeant]] to Chapter Commander took only fourteen years, and that he achieved his Chapter command before the Imperial discovery of his [[Primarch]], [[Lion El'Jonson]]. Indeed, he on occasion referred to being given his power and honours by the Emperor himself.{{Fn|1}},{{Fn|4}} However, other information about Astelan states that, as a recognised veteran, he was in fact appointed Chapter Master by Lion El'Jonson in the years following Jonson's assumption of command of the First Legion.{{Fn|3a}}