Hades was the god of the Underworld and the brother of Zeus and Poseidon. He abducted Persephone, daughter of Zeus and Demeter, making her his wife and queen of the Underworld. This caused Demeter to lament and stop crops from growing, until Zeus intervened to have Persephone return part of each year. The realm of Hades included rivers like Acheron and Styx, the dog Cerberus guarding the entrance, and places like Elysium for heroes and Tartarus for punishment of sinners.