Tiresias was the great blind seer of Thebes, whose prophetic counsel ran through the entire Theban tragic cycle from Cadmus to the war of the Epigoni. The accounts of his blindness and his prophetic gift were two: in one version, he had stumbled upon Athena bathing, and the goddess in the privacy-protective convention had blinded him, but afterwards (mollified by his mother Chariclo's pleas) had compensated him with the gift of prophecy and the understanding of the speech of birds. In the other and more famous version, he had once come upon a pair of mating snakes on Mount Cyllene and struck them with his stick, killing the female; he was thereupon transformed into a woman, and lived for seven years (or in some versions one year) as a woman before encountering another pair of snakes and, by the same act, being restored to manhood.
Having been thus uniquely both man and woman, he was called upon when Zeus and Hera quarreled over which sex enjoyed greater pleasure in love (Zeus saying women, Hera saying men); they referred the question to Tiresias, who answered that of ten parts of the pleasure of love, the woman has nine and the man one. Hera, in fury at having her case lost (or, in a kinder version, simply at the public discussion), blinded him; Zeus, unable to undo Hera's act, gave him the gift of prophecy and a long life as compensation.
The figure thereafter appears in the great Theban narratives. He warned Pentheus against opposing Dionysus; he was consulted by Oedipus and revealed (with prophetic indirection) the truth of the king's parricide and incest; he advised Creon during the war against Thebes, and was the prophet who instructed Eteocles and Polynices's successors on the matter of the buried serpent at Thebes; he died at length on the road from Thebes after the city had fallen, drinking from a cold spring near Tilphusa. His ghost, in the Odyssey, is the one Odysseus consults at the borders of the underworld for prophetic guidance — the only ghost retaining its full memory and prophetic capacity in the realm of the dead.






