E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Cassandra.
Daughter of Priam, gifted with the power of prophecy; but Apollo, whom she had offended, brought it to pass that no one believed her predictions. (Shakespeare: Troilus and Cressida.)
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Those who foresee and predict the downfall, meet with the fate of Cassandra.The Times.