Title: Pluto (mythology)
Content:  is the major Greek source on its significance. Under the name Pluto, the god appears in other myths in a secondary role, mostly as the possessor of a quest-object, and especially in the descent of Orpheus or other heroes to the underworld. Plūtō (genitive Plūtōnis) is the Latinized form of the Greek Plouton. Pluto's Roman equivalent is Dis Pater, whose name is most often taken to mean "Rich Father" and is perhaps a direct translation of Plouton. Pluto was also identified with the obscure Roman Orcus, like Hades the name of both a god of the underworld and the underworld as a place. Pluto (Pluton in French and German, Plutone in Italian) becomes the most common name for the classical ruler of the underworld in subsequent Western literature and other art forms.
Title: Orcus
Content:  Orcus (Orcus) was a god of the underworld, punisher of broken oaths in Etruscan and Roman mythology. As with Hades, the name of the god was also used for the underworld itself. In the later tradition, he was conflated with Dis Pater. A temple to Orcus may once have existed on the Palatine Hill in Rome. It is likely that he was transliterated from the Greek daemon Horkos, the personification of oaths and a son of Eris.
Title: Orcus
Content:  The origins of Orcus may have lain in Etruscan religion. The so-called “Tomb of Orcus”, an Etruscan site at Tarquinia, is a misnomer, resulting from its first discoverers mistaking a hairy, bearded giant for Orcus; it actually depicts a Cyclops. The Romans sometimes conflated Orcus with other gods such as Pluto, Hades, and Dis Pater, all gods of the land of the dead. The name “Orcus” seems to have been given to the malicious and punishing side of the ruler of the underworld, as the god who tormented evildoers in their afterlife. Like the name Hades, “Orcus” could mean both the land of the dead itself, as well as 
Title: Pluto (mythology)
Content:  Pluto (, Ploutōn) was the ruler of the underworld in classical mythology. The earlier name for the god was Hades, which became more common as the name of the underworld itself. In ancient Greek religion and mythology, Pluto represents a more positive concept of the god who presides over the afterlife. Ploutōn was frequently conflated with Ploutos, the Greek 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. The name Ploutōn came into widespread usage with the Eleusinian Mysteries, in which Pluto was venerated as both a stern ruler and a loving husband to Persephone. The couple received souls in the afterlife and are invoked together in religious inscriptions, being referred to as 
Title: Pluto (mythology)
Content:  Medieval mythographies, written in Latin, continue the conflation of Greek and Roman deities begun by the ancient Romans themselves. Perhaps because the name Pluto was used in both traditions, it appears widely in these Latin sources for the classical ruler of the underworld, who is also seen as the double, ally, or adjunct to the figure in Christian mythology known variously as the Devil, Satan, or Lucifer. The classical underworld deities became casually interchangeable with Satan as an embodiment of Hell. For instance, in the 9th century, Abbo Cernuus, the only witness whose account of the Siege of Paris survives, called the invading Vikings the "spawn of Pluto." In the Little 
Title: Pluto (Marvel Comics)
Content:  Pluto is the Olympian god of the Underworld, death, and the dead, and is the Monarch of Hades. Much of the character's story parallels that of traditional Greek Myth. To wit, after defeating their father Cronus, Pluto and his brothers Zeus and Neptune as well as his sisters Hera, Hestia and Demeter drew lots to divide Cronus' empire among them. Pluto gained control of the Underworld as the judge of the dead. However, in the Marvel Universe, Pluto is a scheming god that plans to overthrow Zeus, which no Greek Myth supports. His most infamous act is when he takes Zeus' and Demeter's daughter, his niece Persephone (also known as Kore) as his wife 
Title: Pluto (mythology)
Content:  and performance typically name the ruler of the underworld as Plouton, as for instance in the Bibliotheca. The myth demonstrates the importance of Pluto "the Rich" as the possessor of a quest-object. Orpheus performing before Pluto and Persephone was a common subject of ancient and later Western literature and art, and one of the most significant mythological themes of the classical tradition. The demonstration of Orpheus's power depends on the normal obduracy of Pluto; the Augustan poet Horace describes him as incapable of tears. Claudian, however, portrays the steely god as succumbing to Orpheus's song so that "with iron cloak he wipes his tears" (ferrugineo 
Title: Pluto (mythology)
Content:  In Greek religious practice, Pluto is sometimes seen as the "chthonic Zeus" (Zeus Chthonios or Zeus Catachthonios ), or at least as having functions or significance equivalent to those of Zeus but pertaining to the earth or underworld. In ancient Roman and Hellenistic religion, Pluto was identified with a number of other deities, including Summanus, the Roman god of nocturnal thunder; Februus, the Roman god from whose purification rites the month of February takes its name; the syncretic god Serapis, regarded as Pluto's Egyptian equivalent; and the Semitic god Muth (Μούθ). Muth was described by Philo of Byblos as the equivalent of both Thanatos (Death personified) and Pluto. The ancient Greeks did not regard Pluto as "death" per se.
Title: Pluto (mythology)
Content:  plenty" (cornucopia), by means of which Plouton is distinguished from the gloomier Hades. The Roman poet Ennius (ca. 239–169 BC), the leading figure in the Hellenization of Latin literature, considered Pluto a Greek god to be explained in terms of the Roman equivalents Dis Pater and Orcus. It is unclear whether Pluto had a literary presence in Rome before Ennius. Some scholars think that rituals and beliefs pertaining to Pluto entered Roman culture with the establishment of the Saecular Games in 249 BC, and that Dis pater was only a translation of Plouton. In the mid-1st century BC, Cicero identifies Pluto with Dis, explaining that "The earth in all its power and plenty is sacred 
Title: Pluto (mythology)
Content:  The Orphic Hymn to Pluto addresses the god as "strong-spirited" and the "All-Receiver" who commands death and is the master of mortals. His titles are given as Zeus Chthonios and Euboulos ("Good Counsel"). In the hymn's topography, Pluto's dwelling is in Tartarus, simultaneously a "meadow" and "thick-shaded and dark," where the Acheron encircles "the roots of the earth." Hades is again the name of the place, here described as "windless," and its gates, through which Pluto carried "pure Demeter's daughter" as his bride, are located in an Attic cave within the district of Eleusis. The route from Persephone's meadow to Hades crosses the sea. The hymn concludes: You alone were born to judge deeds obscure and conspicuous. Holiest and illustrious ruler of all, frenzied god, You delight in the worshiper's respect and reverence. Come with favor and joy to the initiates. I summon you. The hymn is one of several examples of Greco-Roman prayer that express a desire for the presence of a deity, and has been compared to a similar epiclesis in the Acts of Thomas.

Question: roman god of the underworld also called orcus or pluto?
Answer: Dis Pater.