Erechtheus

Legendary king of Athens.

According to legend, when Eumolpus attacked Athens in support of the Eleusinians, Erechtheus inquired of the oracle how his people could win the war. The oracle told him that he had to sacrifice one of his four daughters if the Athenians were to win. When this was done, the other daughters killed themselves, having taken an oath to die together. Eumolpus was killed and Erechtheus was victorious, but he himself was killed by Zeus with a thunderbolt at the request of Poseidon, the god of the sea.