The king who stole spa-girls and loved his own daughter to death

 Agamemnon does eventually sacrifice Iphigenia. Her death appeases Artemis and the Greek army set out for Troy.

After bitterly berating Calchas for his painful prophecies, which first forced him to sacrifice his daughter and now to return his concubine, Agamemnon reluctantly agrees. However, Agamemnon demands a new prize from the army as compensation and seizes Achilles' prize, the beautiful captive Briseis. 

In Homer's version of the story in the Odyssey, Aegisthus ambushes and kills Agamemnon in a feasting hall under the pretense of holding a feast in honor of Agamemnon's return home from Troy.^[23] Clytemnestra also kills Cassandra. Her motivations are her wrath at the sacrifice of Iphigenia (as in the Oresteia and Iphigenia at Aulis) and her jealousy of Cassandra and other war prizes taken by Agamemnon