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Pluto (mythology) - Wikipedia
In ancient Roman religion and mythology, Pluto (Ancient Greek: Πλούτων, romanized: Ploútōn, Latin: Plūto or Plūton), also known as Dis Pater or Orcus, was the god of the dead and the king of the underworld. The name was originally an epithet or theonym for Hades in ancient Greek religion and mythology, although Pluto was more associated with wealth and never used as a synonym for ...
In 2006, the International Astronomical Union (IAU) formally redefined the term planet to exclude dwarf planets such as Pluto. Many planetary astronomers, however, continue to consider Pluto and other dwarf planets to be planets.