The grave, or the god of that region where the dead go to before they are admitted into Elysium or sent to Tartaros.
“Brothers, be of good cheer, this night we shall sup with Pluto.” —Leonidas to the three hundred Spartans before the battle of Thermopylae.
Give the untasted portion you have won ... To those who mock you, gone to Pluto's reign.
Many artists of great repute have painted this god, the three most famous being that by Jule-Romain (1492-1546), a pupil of Raphael, in Mantua; one by Augustin Carrache (1558-1601), in Modena, generally called Il Famoso; and the third by Luc Giordano (1632-1701), in the gallery of the Palace Riccardi. Raphael has introduced Pluto in his Assembly of the Gods.
In the Villa Albani of Rome is the famous antique statue of Pluto and Cerberus.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894