In Greco-Roman myths, the god associated with death is Hades in Greek mythology and Pluto in Roman mythology. He rules the Underworld, governing the realm where souls go after death. Often depicted as stern and unyielding, Hades is not necessarily malevolent but serves to maintain balance between life and death. His significance lies in the natural cycle of existence, where he ensures the return of life to the earth through the seasons and governs the souls of the deceased, representing the inevitability of mortality.