In Greek mythology, Hades, the god of the underworld, was the first-born son of the Titans Cronus and Rhea. He had three older sisters, Hestia, Demeter, and Hera, as well as a younger brother, Poseidon, all of whom had been swallowed whole by their father as soon as they were born. Zeus was the youngest child and through the machinations of their mother, Rhea,