The most famous nekromanteion (or nekyomanteion), or oracle of the dead, of the ancient Greek world lies near the northwest shores of the Acherousian Lake, where Acheron and Kokytos, the rivers of Hades, meet. Ancient literary sources describe the Acherousian Lake as the place where the dead began their descent to Hades, and associate Ephyra, the Epirote city located further north, with the ancient cult of the god of death. The nekromanteion attracted people wishing to meet the souls of the dead, as these were able to foresee the future after having left their body. Homer provides the earliest reference to the nekromanteion of Acheron in his Odyssey, when Circe advises Ulysses to meet Teiresias, the blind seer, in the underworld in order to get an oracle for his return to Ithaka (k, 488, etc). Homer also gives a vivid account of the mortal Odysseus's descent to Hades (l, 24, et.c.). The resemblance between the setting described by Homer and the site of the nekromanteion is astonishing, a fact also noted almost one thousand years later by Pausanias, who argues that Homer had visited this area (1.17.5). Other Greek heroes also attempted the descent into Hades: Orpheus seeking to bring back his beloved Eurydice, Hercules in his search for Cerberus, the tree-headed dog guarding the exit from Hades, whom King Eristheas had asked for, and Theseus with Peirithos in order to seize Persephone.