During the Roman Imperial era, the Greek geographer Strabo (1st century AD) makes a distinction between Pluto and Hades. In writing of the mineral wealth of ancient Iberia (Roman Spain), he says that among the Turdetani, it is "Pluto, and not Hades, who inhabits the region down below." In the discourse "On Mourning" by the Greek author Lucian (2nd century AD), Pluto's "wealth" is the dead he rules over in the abyss "(chasma)"; the name "Hades" is reserved for the underworld itself.