Gates of hell unearthed by Italian archaeologists is said to be the entry gate to the Underworld; it is linked to the Greco-Roman mythology and tradition. Rivers Cocytus, Lethe, Phlegethon and Styx were also entrances to the Underworld. The god Hades kidnapped the goddess Persephone from a field in Sicily and led her to the Underworld through a cleft in the earth so he could marry her. Into the medieval period, Mount Etna on Sicily was considered to be an entryway to hell. The gates of hell were commonly depicted as jaws, forming the Hellmouth, which was simultaneously the entrance to hell and
Pluto uses "Sao Diêm Vương", which was derived from the Chinese term 閻王 (Yánwáng), as "minh" is a homophone for the Sino-Vietnamese words for "dark" (冥) and "bright" (明)). Some Indian languages use the name Pluto, but others, such as Hindi, use the name of "Yama", the God of Death in Hindu and Buddhist mythology. Polynesian languages also tend to use the indigenous god of the underworld, as in Māori "Whiro". Once Pluto was found, its faintness and lack of a resolvable disc cast doubt on the idea that it was Lowell's Planet X. Estimates of Pluto's mass were revised downward