Hades

In Homeric and Ionic Greek, he was known as Áïdēs.[6] Other poetic variations of the name include Aïdōneús (Ἀϊδωνεύς) and the inflected forms Áïdos (Ἄϊδος, gen.), Áïdi (Ἄϊδι, dat.), and Áïda (Ἄϊδα, acc.), whose reconstructed nominative case *Áïs (*Ἄϊς) is, however, not attested.[7] The name as it came to be known in classical times was Háidēs (Ἅιδης). Later the iota became silent, then a subscript marking (Άͅδης), and finally omitted entirely (Άδης).[8]