Before the introduction into Rome of the religion and literature of Greece, the Romans had no belief in a realm of future happiness or misery, corresponding to the Greek Hades; hence they had no god of the lower world identical with Aïdes. They supposed that there was, in the centre of the earth, a vast, gloomy, and impenetrably dark cavity called Orcus, which formed a place of eternal rest for the dead. But with the introduction of Greek mythology, the Roman Orcus became the Greek Hades, and [137]all the Greek notions with regard to a future state now obtained with the Romans, who worshipped Aïdes under the name of Pluto, his other appellations being Dis (from dives, rich) and Orcus from the dominions over which he ruled. In Rome there were no temples erected to this divinity.