One of them was the daughter of King Pittheus of Troezen, who after lying with Aegeus and Poseidon, gave birth to the famous hero Theseus. When Theseus grew up, he kidnapped Helen and gave her to his mother; however, Helen’s brothers, the Dioscuri, managed to bring Helen back and in retaliation, abducted Aethra. She, along with Helen, went to Troy, until she was freed by her grandson, after the fall of the city.
Another Aethra was one of the daughters of the Titans Oceanus and Tethys; she may also have been the wife of Atlas, or Hyperion; thus, depending on who her husband was, she may have been either the mother of the Pleiades and the Hyades, or of Helios, Eos and Selene.
Aethra Is also called Aithra.