Aedon

In Greek mythology, Aedon, son of Pandareus, was the wife of Zethus. The pair had one daughter, Itylus. Aedon accidentally killed her and was stricken with grief and guilt. In pity, the gods turned her into a nightingale, which cries with sadness every night. Alternatively, she was the queen of Thebes, who attempted to kill the son of her rival, Niobe, also her sister-in-law, and accidentally killed her own daughter instead and thus, the gods again changed her into a nightingale.

Odyssey XIX, 518.