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Cassandra, in Greek mythology the daughter of Priam, the last king of Troy, and his wife Hecuba. She was also known as Alexandra. She and her twin brother, Helenus, had prophetic abilities, but Cassandra, unlike Helenus, was a tragic figure who was fated never to be believed. She accurately predicted such events as the fall of Troy and the death of Agamemnon, but her warnings went unheeded. In Homer’s Iliad she is the most beautiful...