From The Art and Popular Culture Encyclopedia In ancient Greek
religion and myth, Pluto (Πλούτων, Ploutōn) was a name for the
ruler of the underworld; the god was also known as Hades, a name
for the underworld itself. This deity has two major myths: in
Greek cosmogony, he received the rule of the underworld in a
three-way division of sovereignty over the world, with his
brothers Zeus ruling Heaven and Poseidon the Sea; and he abducts
Persephone to be his wife and the queen of his realm. In other
myths, he plays a secondary role, mostly as the possessor of a
quest-object. The name Ploutōn was frequently conflated with
that of Plutus (Πλοῦτος, Ploutos), a god of wealth, because
mineral wealth was found underground, and because as a chthonic
god Pluto ruled the deep earth that contained the seeds
necessary for a bountiful harvest. Ploutōn became a more
positive way to talk about the ruler of the underworld, and the
name was popularized through the mystery religions and
philosophical systems influenced by Plato,