in the hyperion series by dan simmons, the character you're thinking of is likely "field marshal" john keats. he appears in the context of the far-future setting of the novels, which blend science fiction with literary references. in the hyperion series, field marshal john keats is a significant character who embodies themes of war, sacrifice, and the human condition. the series itself weaves together multiple narratives, exploring philosophical and existential questions through the journeys of its characters.
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