Herse, Pandroso and Aglauros, the three daughters of the king of Attica Cécrope I, received from Athena a closed box, forbidding them to look inside. Pandroso obeyed, but the other two did not, and they went crazy when they saw Erictônio, throwing himself from the steepest part of the acropolis. Erictonius was the son of Athena and Hephaestus.
According to Jerónimo de Estridão, Erictónio was the son of Vulcan and Minerva, and he reigned from 1,437 B.C. to 1,487 B.C., being preceded by Amphicto and succeeded by Pandião I.
Pseudo-Apollodore, after presenting Erictónio as son of Hephaestus and Attis, daughter of Cranau, explains the alternative version of how he could be son of Athena, being a virgin Athena: Athena had approached Hephaestus, desirous of the weapons he manufactured, when, rejected by Aphrodite, Hephaestus falls in love with Athena. He chases her, but she runs away, and when he manages to grab her, she doesn't allow sex, and Hephaestus ejaculates on Athena's thigh. Disgusted, she cleans herself, and makes the semen fall to the floor, and from there Erictónio is born.
After Erictónio was born, Athena created him, hidden from the other gods, and placed him in a chest, handing him over to Pandroso, daughter of Cécrope I, and forbidding her to open the chest. But his curious sisters opened it and saw a snake coiled around the baby. According to some authors, they were killed by the snake, according to others, they went mad because of Athena's wrath and threw themselves off the acropolis.