Pluto was the god of the underworld in Roman mythology. He abducted Proserpina (Gr. Persephone), and her mother Ceres (Gr. Demeter) caused winter in her grief. He kidnapped Persephone so he could marry her. In later times he was largely seen as synonymous with the Greek god of the underworld Hades.
The planet Pluto is — in part — named after him.
Pluto (Greek: Πλούτων) should not be confused with the Greek god Ploutos (Πλούτος), the god of wealth.