Persephone was the daughter of Zeus and Demeter
(Styx was her mother by a different account). When
Hades fell in love with Persephone, he conspired
with his brother ( Zeus) to kidnap her when her
mother was not around. This occurred when she was picking flowers near Etna
in Sicily. Although Zeus later demanded Persephone's
return to the world above she was by then tied to the
Underworld forever. Nonetheless,
Zeus decided that she should share her time between
the Underworld and the world above.