Persephone was picking flowers for her mother, Demeter.
Out of nowhere a large, menacing chasm appeared, and out came Hades, the god of the Underworld.
After finding out what had happened, Demeter stormed Olympus and demanded Persephone to be returned. Until then, she threatened the Earth would yield no crops.
After a while, Hades made a break through to Persephone. She started to enjoy his company, and would have him escorting her whenever she explored the castle.
Right before Hermes could deliver the message, Hades finally convinced Persephone to eat 6 pomegranate seeds, forcing her to stay for at least 6 months of the year with him.
And now every year, when Persephone willingly returns to her husband, Demeter becomes sad and distressed, causing the seasons Fall and Winter. In Spring and Summer, she prepares the crops and flowers for her daughter´s return.