One of the
greatest seers, who helped the Greeks at the Trojan war by telling them the
wishes and moods of the gods.
It was he who told Agamemnon
that he must sacrifice his daughter Iphigenia
in order for the Greek fleet to be able to sail off, it was he who saw that
the war would take ten years and it was also Calchas who understood that the
Greeks suffered plague because Apollo
was upset about Agamemnon taking Briseis
as his mistress. Calchas had also seen that Troy would not be defeated if
Achilles did not fight
with the Greeks.