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In page Polyxena:

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Polyxena is considered the Trojan version of Iphigenia, daughter of Agamemnon and Clytemnestra. She is not in Homer's Iliad, appearing in works by later poets. An oracle prophesied that Troy would not be defeated if Polyxena's brother, Prince Troilus, reached the age of twenty.[citation needed] During the Trojan War, Polyxena and Troilus were ambushed when they were attempting to fetch water from a fountain, and Troilus was killed by the Greek warrior Achilles, who soon became interested in the quiet sagacity of Polyxena.[1]