The ancient Greek god of the underworld is Hades. In Greek mythology, Hades is the brother of Zeus and Poseidon, and he rules over the realm of the dead. His domain is often depicted as a shadowy place where souls go after death, and it is frequently associated with concepts of the afterlife and judgment. Hades is not typically portrayed as evil but rather as a necessary and authoritative force maintaining order in the afterlife. His portrayal in myth often contrasts with the more favorable views of Olympian gods and emphasizes the inevitability of death and the importance of respecting the dead.