In Roman mythology, the figure associated with the underworld and the judgment of souls is Pluto, also known as Hades in Greek mythology. He rules over the afterlife and governs the souls of the deceased. Pluto is often depicted with his three-headed dog, Cerberus, to guard the entrance to the underworld, preventing dead souls from escaping. His role emphasizes themes of mortality, the afterlife, and the inevitable fate that awaits all. Despite being often viewed as a grim figure, Pluto also plays a crucial role in the cycle of life and death.