Chthonia.

About Chthonia

In Greek mythology, the name Chthonia may refer to:Chthonia, an Athenian princess and the youngest daughter of King Erechtheus and Praxithea, daughter of Phrasimus and Diogeneia. She was sacrificed by her father who had received a prophecy according to which he could win the imminent battle against Eumolpus only if he sacrificed his daughter. Her sisters who had sworn to kill themselves if one of them died, fulfilled their oath by throwing themselves off a cliff. According to the dictionary Suda, only two of the sisters, Protogeneia and Pandora, did commit suicide which made sense, since of the other daughters of Erechtheus, Orithyia had been abducted by Boreas, Procris married off to Cephalus, and Creusa was still a baby at the time the oath had been sworn. It was also said, however, that Chthonia married her uncle Butes, which probably indicated a version that she was not sacrificed. Her other siblings were Cecrops, Pandorus and Metion, and possibly Merope, Orneus, Thespius, Eupalamus and Sicyon.