In Roman mythology, the god who presides over the underworld is Pluto, also known as Hades in Greek mythology. Pluto governs the realm of the dead and is associated with wealth, as the underworld is often linked to precious minerals and resources. He is depicted as a somber figure, often elusive and rarely interacting with the living. Pluto's significance in mythology highlights themes of death, rebirth, and the afterlife, illustrating ancient beliefs related to the human experience and the inevitability of mortality in Roman thought.