Hades in Wikipedia

Hades (Άδης or Ἀΐδας; from Greek ᾍδης, Hadēs, originally Ἅιδης, Haidēs or Άΐδης, Aidēs, meaning "the unseen"[1][2]) refers both to the ancient Greek underworld, the abode of Hades, and to the god of the underworld. Hades in Homer referred just to the god; the genitive ᾍδου, Haidou, was an elision to denote locality: "[the house/dominion] of Hades". Eventually, the nominative, too, came to designate the abode of the dead...

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