Etymology and parallel cults
The name is etymologically derived from τρέφω trepho, "to nourish". Strabo and several inscriptions refer to him as Zeus Trephonios. Several other chthonic Zeuses are known from the Greek world, including Zeus Μειλίχιος Meilikhios ("honeyed" or "kindly" Zeus), and Zeus Χθόνιος Chthonios ("Zeus beneath-the-earth").
Trophonius in myth
In Greek mythology, Trophonius was a son of Erginus. According to the Homeric Hymn to Apollo, he built Apollo's temple at the oracle at Delphi with his brother, Agamedes. Once finished, the oracle told the brothers to do whatsoever they wished for six days and, on the seventh, their greatest wish would be granted. They did and were found dead on the seventh day. The saying "those whom the gods love die young" comes from this story.
Alternatively, according to Pausanias they built a treasure chamber (with secret entrance only they knew about) for King Hyrieus of Boeotia. Using the secret entrance, they stole Hyrieus' fortune. He was aware but did not know who the thief was; he laid a snare. Agamedes was trapped in it; Trophonius cut off his head so that Hyrieus would not know who the body in the snare was. He then fled into the cavern at Lebadaea, and disappeared forever.
The cave of Trophonius was not discovered again until the Lebadaeans suffered a plague, and consulted the Delphic Oracle. The Pythia advised them that an unnamed hero was angry at being neglected, and that they should find his grave and offer him worship forthwith. Several unsuccessful searches followed, and the plague continued unabated until a shepherd boy followed a trail of bees into a hole in the ground. Instead of honey, he found a daimon, and Lebadaea lost its plague while gaining a popular oracle.
Plutarch's De Genio Socratis relates an elaborate dream-vision concerning the cosmos and the afterlife that was supposedly received at Trophonius's oracle.
Trophonius in cult
Pausanias, in his account of Boeotia (9.39), relates many details about the cult of Trophonius. Whoever desired to consult the oracle would live in a designated house for a period of days, bathing in the river Herkyna and living on sacrificial meat. He would then sacrifice, by day, to a series of gods, including Cronus, Apollo, Zeus the king, Hera the Charioteer, and Demeter-Europa. At night, he would cast a black victim into a pit sacred to Agamedes, drink from two rivers called Lethe and Mnemosyne, and then descend into a cave. Here, most consultees were frightened out of their wits, and forgot the experience entirely upon coming up.
Afterward, the consultee would be seated upon a chair of Mnemosyne, where the priests of the shrine would record his ravings and compose an oracle out of them.
Trophonius in the classical tradition
"To descend into the cave of Trophonios" became a proverbial way of saying "to suffer a great fright". This saying is alluded to in Aristophanes' Clouds.
Several ancient philosophers, including Heraclides Ponticus, wrote commentaries on the cult of Trophonios that are now sadly lost. Trophonios has been of interest to classical scholars because the rivers of Lethe and Mnemosyne have close parallels with the Myth of Er at the end of Plato's Republic, with a series of Orphic funerary inscriptions on gold leaves, and with several passages about Memory and forgetting in Hesiod's Theogony. The Hellfire Club once constructed a "Cave of Trophonius" with obscene wall-paintings in which to conduct their revels. The philosopher Friedrich Nietzsche calls himself a "Trophonios" in the preface to his Daybreak, alluding to his labor in the underground of moral prejudices.
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