Hades

Hades (/ˈheɪdiːz/; Ancient Greek: ᾍδης, *Hā́idēs*) ruled as god of the dead and king of the underworld in ancient Greek religion and mythology, with his realm eventually becoming synonymous with his name. As the firstborn son of Cronus and Rhea, he was ironically the last to be freed from his father's stomach. Alongside his brothers Zeus and Poseidon, he overthrew the Titans and divided the cosmos: Zeus claimed the heavens, Poseidon the seas, and Hades the underworld, while the earth (traditionally Gaia's domain) remained accessible to all three. Artists typically depicted him wielding a bident, wearing his helm, and accompanied by Cerberus, the three-headed hound that guarded the underworld.
Later mythographers of the Roman era merged Hades with the Etruscan deity Aita and the Roman gods Dis Pater and Orcus into the figure of Pluto - a Latinized version of Plouton (Πλούτων, *Ploútōn*), a euphemistic title meaning "the rich one" often used for Hades.