
More about this in a good NPR story on the often illicit quest for ancient art: 'Chasing Aphrodite' And Other Dirty Art World Deals


They levelled a place for the dance, and marked out a fair wide ring, and the herald came near, bearing the clear-toned lyre for Demodocus. He then moved into the midst, and around him stood boys in the first bloom of youth, well skilled in the dance, and they smote the goodly dancing floor with their feet. And Odysseus [265] gazed at the twinklings of their feet and marvelled in spirit.But the minstrel struck the chords in prelude to his sweet lay and sang of the love of Ares and Aphrodite of the fair crown, how first they lay together in the house of Hephaestus secretly; and Ares gave her many gifts, and shamed the bed [270] of the lord Hephaestus. But straightway one came to him with tidings, even Helius, who had marked them as they lay together in love.Helios at the Forge of Hephaestus, VelazquezAnd when Hephaestus heard the grievous tale, he went his way to his smithy, pondering evil in the deep of his heart, and set on the anvil block the great anvil and forged bonds [275] which might not be broken or loosed, that the lovers1 might bide fast where they were. But when he had fashioned the snare in his wrath against Ares, he went to his chamber where lay his bed, and everywhere round about the bed-posts he spread the bonds, and many too were hung from above, from the roof-beams, [280] fine as spiders' webs, so that no one even of the blessed gods could see them, so exceeding craftily were they fashioned.But when he had spread all his snare about the couch, he made as though he would go to Lemnos, that well-built citadel, which is in his eyes far the dearest of all lands. [285] And no blind watch did Ares of the golden rein keep, when he saw Hephaestus, famed for his handicraft, departing, but he went his way to the house of famous Hephaestus, eager for the love of Cytherea of the fair crown. Now she had but newly come from the presence of her father, the mighty son of Cronos, [290] and had sat her down. And Ares came into the house and clasped her hand and spoke and addressed her: “Come, love, let us to bed and take our joy, couched together. For Hephaestus is no longer here in the land, but has now gone, I ween, to Lemnos, to visit the Sintians of savage speech.” Odyssey 8.260 ff

That there is something profoundly foreign, obscure and disquieting in Greek art which no longer allows one to speak simply of "griechische Heiterkeit", "Greek serenity", according to the classical formula, this is exactly what Nietzsche undertook to show since The Birth of Tragedy, by making apparent, under the beautiful appearance and the measure characterising apollinian civilisation, the barbaric and titanic nature of its dionysiac foundation, and thus bestowing a fundamental importance to this oriental god that is Dionysus for the definition of what constitutes what is proper to the Hellenic [le grec]. -- Francoise Dastur, "Holderlin and the Orientalisation of Greece"
Contemporary scholarship is still wrestling with Dionysus and his enigmatic place in the otherwise stately, ordered pantheon of the Olympians. Masks of Dionysus (Myth and Poetics) collected essays addressing not only the interpretive challenges of the mythical god, but also his place in Greek tragedy, in art, and in ancient cultic rites. Entire books have focused on "the Dionysian" in modern thought, whether Nietzsche's or those influenced by his thinking. One example: The Dionysian Self: C.G. Jung's Reception of Friedrich Nietzsche, by Paul Bishop. Not only is the Dionysian still hot, it's also pricey -- each of these works of scholarship retails new for over $200. Driven to wandering, at length his [Cadmus'] journey carried him and his wife to the borders of Illyria. Now, weighed down by age and sadness, they thought of the original destiny of their house, and in talk reviewed their sufferings. Cadmus said ‘Surely that snake, my spear pierced, must have been sacred, when, fresh from Sidon, I scattered the serpent’s teeth, a strange seed, over the earth? If that is what the gods have been avenging with such sure anger, may I myself stretch out as a long-bellied snake.’ Metamorphoses 4.563ff
“Quid, Agenore nate, peremptumCadmus is testing a new hypothesis -- that he was not a valiant hero, a bringer of civilization, a warrior whom the gods loved:
serpentem spectas? et tu spectabere serpens.” Meta. 3.97-98
And, so speaking, he did extend into a long-bellied snake, and felt his skin hardening as scales grew there, while dark green patches checkered his black body. He lay prone on his breast, and gradually his legs fused together thinning out towards a smooth point. Still his arms were left to him, and what was left of his arms he stretched out, and, with tears running down his still human cheeks, he said ‘Come here, wife, come here, most unfortunate one, and while there is still something left of me, touch me, and take my hand, while it is still a hand, while the snake does not yet have all of me.’ (Kline trans.)
And Pentheus -- did martial rigor blind him to the story of Acoetes, and to the child-god of the thyrsus and the 

. . . the Greek writer Herodotus tells the story of Arion, a lyre-player from Methymna employed by Periander, King of Corinth. Arion is a talented and innovative musician whose performances around the Mediterranean have made him extremely rich. Sailing home from a lucrative tour of Italy to his native Corinth, his crew turn on him, threatening to throw him overboard and take his money. Arion tries to bargain for his life but the crew will have none of it and give him a choice: either lie kills himself or they throw him over the side. Arion, for reasons that Herodotus doesn't really explain, asks if he might sing one last song. The crew agree - after all, why turn down a free farewell concert from the best singer in the known world? As the last note dies away, Arion leaps into the sea.
The ship sails on, but instead of drowning, Arion is rescued by a school of dolphins that have been beguiled by the beauty of his music and carry him to shore. He makes his way back to Corinth and tells his story to King Periander, who cannot believe it. The plot is eventually uncovered when the ship arrives and the crew swear that they left Arion alive and well in Italy.
This image of dolphins rescuing sailors or carrying humans recurs again and again in myth and folklore.
The Greek Bacchoi claimed that, like wine, Dionysus had a different flavour in different regions; reflecting their mythical and cultural soil, he appeared under different names and appearances in different regions.

When we were reading the Cadmus episode, a lot of questions were provoked by this curious tale, told with great economy, leaving many things open, undecided - such as, can we say with certitude that Cadmus was doing the will of the gods every step of the way? Was that will so clear and unambiguous, both in its expression, and in the means of its execution? For example, when Cadmus was told to follow an unyoked cow, how do we know he followed the right cow? Such questions linger, and without some clairvoyant Tiresias to help us out, appear to remain unanswerable.Note: This is what leaders do. They interpret the nation's past to bring clarity to the present. But this turning tends to collapse origin and end -- "this is where we came from, this determines our character, and our character determines how we shall act." In our beginning is our end. Except in this particular case, the origins are peculiar to say the least - combining the act of sowing with the violence of armed soldiers, and lacking, among other things, a standard sexual conception, a human mother, and the normal course of childrearing.
Speaking of Thebes, why is it that Ovid carefully leaves out any scene-setting that evokes the city? In all of book 3, purportedly the book about the founding of that mighty city, there is not a single detail that says "city." All the action takes place in remote places, at secret pools (Cadmus-Actaeon-Narcissus) or secret rendezvous with Zeus (Semele). Once Pentheus enters, he too is not situated by any word or descriptive item as being in a city. And we know where he'll end his life -- in an open field on Cithaeron, the mountain that marks the border between Boeotia and Attica. Which happens to be the mountain where Actaeon was dismembered, where Echo was heard, and where the baby Oedipus will be exposed. Some say that the cave where Dionysus was born was on Cithaeron. Book 3 is not a book of the city, but of a fateful mountain in the wilderness, where even certain mortals were said to be nympholeptoi -- possessed by the Sphragitides, nymphs who lived in a grotto on Cithaeron (these nympholeptoi were said to possess oracular power).
The ship landed in Scios,
men wanting spring-water,
And by the rock-pool a young boy loggy with vine-must,
"To Naxos? Yes, we'll take you to Naxos,
Cum' along lad." "Not that way!"
"Aye, that way is Naxos."
And I said: "It's a straight ship."And an ex-convict out of Italy
knocked me into the fore-stays,
(He was wanted for manslaughter in Tuscany)
And the whole twenty against me,
Mad for a little slave money.And they took her out of Scios
And off her course...
And the boy came to, again, with the racket,
And looked out over the bows,
and to eastward, and to the Naxos passage.God-sleight then, god-sleight:
Ship stock fast in sea-swirl,
Ivy upon the oars, King Pentheus,
grapes with no seed but sea-foam,
Ivy in scupper-hole.Aye, I, Acœtes, stood there,
and the god stood by me,
Water cutting under the keel,
Sea-break from stern forrards,
wake running off from the bow,
And where was gunwale, there now was vine-trunk,
And tenthril where cordage had been,
grape-leaves on the rowlocks,
Heavy vine on the oarshafts,
And, out of nothing, a breathing,
hot breath on my ankles,
Beasts like shadows in glass,
a furred tail upon nothingness.For more, though still only a part of Canto II, see here.

We see the line of Harmonia and Cadmus, son of Agenor, which seemed at first so promising, coming to a dead halt -- the critical moment was the rape of Europa -- not only was she lost to Agenor, but so were all his sons, thanks to his ultimatum ("find her or go into exile"). Interesting to note that Epaphus, son of Io, whom we last saw taunting Phaethon into doubting his paternity, became (with Memphis) the father of Libya, who with Poseidon came to be the mother of Agenor and Belus. Agenor and Beluw thus are genealogically linked to both Zeus and Poseidon.
[1] ((lacuna)) . . . For some say, at Dracanum; and some, on windy Icarus; and some, in Naxos, O Heaven-born, Insewn; and others by the deep-eddying river Alpheus that pregnant Semele bare you to Zeus the thunder-lover. And others yet, lord, say you were born in Thebes; but all these lie. The Father of men and gods gave you birth remote from men and secretly from white-armed Hera. There is a certain Nysa, a mountain most high and richly grown with woods, far off in Phoenice, near the streams of Aegyptus. ((lacuna)) . . .
[1] I will tell of Dionysus, the son of glorious Semele, how he appeared on a jutting headland by the shore of the fruitless sea, seeming like a stripling in the first flush of manhood: his rich, dark hair was waving about him, and on his strong shoulders he wore a purple robe. Presently there came swiftly over the sparkling sea Tyrsenian pirates on a well-decked ship -- a miserable doom led them on. When they saw him they made signs to one another and sprang out quickly, and seizing him straightway, put him on board their ship exultingly; for they thought him the son of heaven-nurtured kings. They sought to bind him with rude bonds, but the bonds would not hold him, and the withes fell far away from his hands and feet: and he sat with a smile in his dark eyes.