Definition: Calchas, son of Thestor, was a seer from a family of seers. Agamemnon employed the services of Calchas in the Trojan War.
Calchas predicted that it would take the Greeks 10 years to defeat Troy.
Calchas was the seer who told Agamemnon that if he wished to be able to set sail from Aulis, he would have to sacrifice his daughter Iphigenia to the goddess Artemis. He also knew that Agamemnon was to blame for the pestilence Apollo sent the Greeks.
Calchas advised the Greeks they needed the bow of Hercules to win the Trojan War.
Alternate Spellings: Kalchas
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