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Antenor is a Trojan commander who has been captured by the Greek army. In the play, the Greeks trade him for Cressida at Calchas' request. Apparently, the guy is one of the Trojan army's top strategists because Calchas tells us that he "is such a wrest in [the Trojans'] affairs /
That their negotiations all must slack, / Wanting his manage" (3.3.23-25).