As in Isaac Asimov's earlier Foundation series, humanity has colonized a galaxy in which there are no competing intelligent species.
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Miles Naismith Vorkosigan, the protagonist of most of the series, is the son of a Betan mother and a Barrayaran aristocrat, embodying this contrast.
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The Barrayarans in reprisal conquer and annex Komarr during the time of Aral Vorkosigan, Count Piotr's second son.
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On Komarr and elsewhere, it was assumed that he killed the officer in order to conceal the fact that he or the Emperor had ordered the massacre, however, resulting in his legendary reputation as "the Butcher of Komarr" and an enduring ill-will expressed in a revolt 10 years later, an assassination plot (Brothers in Arms), and an attempt by Komarrans to close Barrayar's wormhole Komarr).
Known throughout this science fiction universe as “The Butcher of Komarr,” he dominates the imagination of the two main point-of-view characters in the Vorkosigan Saga, Cordelia (in Shards of Honor and Barrayar), who becomes his wife, and their son Miles.