Hades

Hades refers both to the ancient Greek underworld, the abode of Hades, and to the god of the underworld.

According to myth, he and his brothers Zeus and Poseidon defeated the Titans and claimed rulership over the universe ruling the underworld, air, and sea, respectively; the solid earth, long the province of Gaia, was available to all three concurrently.

Symbols associated with him are the Helm of Darkness and the three-headed dog, Cerberus.