Who is the god of the underworld in Greek mythology?

Hades is the god of the underworld in Greek mythology.

He is the eldest son of the Titans Cronus and Rhea and the brother of Zeus, Poseidon, Hera, Demeter, and Hestia. After the younger gods defeated the Titans, the three brothers divided cosmic realms by lot: Zeus received the sky, Poseidon the sea, and Hades the underworld. Earth was understood as shared among them.

Hades ruled the realm of the dead with Persephone, whom myth describes as his queen. The underworld itself was also commonly called Hades, creating a frequent source of confusion: Hades can mean either the god or the place he governs. He was not simply a Greek equivalent of the Devil. Ancient sources generally portray him as stern, implacable, and concerned with the order of the dead rather than as a tempter or embodiment of evil.

Hades was also associated with hidden wealth beneath the earth, including minerals and fertile crops. For this reason Greeks sometimes used the name Plouton, meaning “the wealthy one,” which influenced the Roman figure Pluto.