Jan Johnson, The Sacrifice of Iphigenia, mixed-media sculpture.

Agamemnon killed a stag in a grove sacred to Diana. Angered, Diana stopped the winds so that the Greek fleet could not sail to Troy. The seer Calchas was called upon, and he announced that the only way the Greek fleet could sail was if Iphigenia was sacrificed. Agamemnon, her father, at first adamantly refused, but under pressure, he slowly gave in and agreed to the sacrifice.