The story of Persephone comes from Greek mythology. She is the daughter of Zeus (the king of the gods in Greek mythology) and Demeter, (the goddess of the fertile earth and the harvest).
In the most familiar version of the myth, Persephone is gathering flowers in a meadow near a stream when Hades, the god of the underworld, falls in love with her. He is so taken by his love for her that he rises from the earth, abducts her and carries her down into his realm.
Other stories tell a different story—that Persephone and Hades meet and both fall in love, and Persephone makes the choice to follow Hades back to the underworld on her own, where she then becomes Queen of the Underworld. This is a much more empowering version, because she chooses.
Persephone takes a risk, follows her heart and descends into the underworld, becoming someone more powerful than who she previously was. No longer just a maiden of spring, she becomes someone deeper and more complex.
She becomes Queen.
Above the earth, Demeter discovers her daughter has vanished and searches far and wide for her, but is unable to find her. In her grief, Demeter wanders the world searching for Persephone, refusing food, drink, and rest. The goddess who once nourished the land withdraws her gifts from it. Crops fail, and famine spreads across all the lands. Nothing grows while Demeter mourns.
But by this time, the story has already changed, Persephone is no longer only a missing daughter.
She has crossed a threshold.