Atreus, a son of the hero Pelops (and thus grandson of the infamous Tantalus), competed viciously with his brother Thyestes for the throne of Mycenae. In some traditions, however, Agamemnon was the son not of Atreus but of Atreus’ son Pleisthenes and his wife (whose name was either Aerope, Cleolla, or Eriphyle). More @Wikipedia
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