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Persephone was a goddess who was bride to Hades. She had many followers who believed that the Underworld must be kept away from the land of the living. Her prominent worshipper was Eunapius, who continued to follow her Mysteries of Eleusis, to them she revealed secrets, such as how the still living could travel into the Underworld. (Pandora's Box)


Wikipedia has a more detailed and comprehensive article on Persephone

In Greek mythology, Persephone (/pərˈsɛfəniː/, per-SEH-fə-nee; Greek: Περσεφόνη), also called Kore (/ˈkɔəriː/; "the maiden"), is the daughter of Zeus and the harvest goddess Demeter, and is the queen of the underworld. Homer describes her as the formidable, venerable majestic queen of the underworld, who carries into effect the curses of men upon the souls of the dead. Persephone was abducted by Hades, the god-king of the underworld. The myth of her abduction represents her function as the personification of vegetation, which shoots forth in spring and withdraws into the earth after harvest; hence, she is also associated with spring as well as the fertility of vegetation. Similar myths appear in the Orient, in the cults of male gods like Attis, Adonis and Osiris, and in Minoan Crete.