Tethys

Also Known As: Greek Τηθύς, Tethys; from tethe, “nurse” or “grandmother”; equated by later poets with Thalassa, the Sea
Region/Culture: Southern Europe
Mythos: Greek Mythology
Primary Type/Nature: Gods and Deities
Mythical Attributes: She draws the water of Oceanus through the caverns and channels beneath the earth and feeds it to every river, spring and rain cloud in the world.
Role in Mythos: Titaness consort of Oceanus, mother of the three thousand Rivers and the three thousand Oceanids, and foster mother of Hera.
Relation to Humans: She has no cult, no temple and no myth in which she bargains with a mortal, yet every well and river a Greek farmer depended on was understood to be her water arriving from below. Her one recorded intervention in a human life was to catch a grieving prince as he threw himself off a cliff and cover him in feathers, which was not what he had asked for.

The water arrives before dawn, before anyone is awake to watch it. It comes up cold out of the limestone at the head of a valley, tasting faintly of iron, and it does not stop. Every spring in the Greek world was understood to work like this, fed from beneath by a body of fresh water so large it wrapped the earth entire, and the goddess doing the feeding was Tethys.

Hesiod gives her the fullest inventory any Greek deity receives. She bore to Oceanus the swirling rivers, and then he lists them: Nile, Alpheus, deep-eddying Eridanus, Strymon and Meander, Ister of the beautiful waters, Phasis and Rhesus and silver-swirling Achelous, Nessus, Rhodius, Heptaporus, Haliacmon, Granicus, Aesepus, godlike Simoeis, Hermus and Peneus, strongly flowing Caicus, great Sangarius, Ladon, Parthenius, Evenus, Ardescus, and holy Scamander. Twenty-five named, and the poet then admits he is nowhere near finished. After the rivers came a separate race of daughters, the Oceanids, who keep the young of the world along with Apollo and the rivers, and of those there are three thousand light-stepping girls scattered far and wide. Styx among them has the greatest eminence. Metis and Eurynome and Calypso and Doris are in the same list, which means half the genealogies in Greek myth run back through one marriage.

The plumbing behind all this was taken seriously. Later poets speak of the caverns of Tethys, the hollows under the world where the encircling stream of Oceanus was strained and filtered upward until it broke surface as something drinkable. Plato has Socrates play with the name itself in the Cratylus, deriving it from words for straining and sieving, and calling it the name of a spring somewhat disguised. Whether or not the etymology holds, the picture it assumes is consistent: salt outside, sweet inside, and a goddess with her hands on the valve.

Her own origin is the standard one for the elder generation. Hesiod makes her a daughter of Gaia and Uranus, born in the same brood as Coeus, Crius, Hyperion, Iapetus, Rhea, Themis, Mnemosyne and Phoebe, with Cronus arriving last. Apollodorus lists her first among the Titanesses. Diodorus notes that some writers gave the Titans a different mother altogether, one of the Curetes and a woman named Titaea. There is also an older and far stranger claim sitting inside the Iliad, where Hera calls Oceanus the source from which the gods have risen and Tethys their mother. That is not Hesiod’s cosmogony. It is not anybody’s cosmogony, in Greek. Homer never explains it, and Plato in the Theaetetus files the line under the doctrine that all things are flow and motion.

Walter Burkert set that same passage beside the opening of the Babylonian Enuma Elish, where Apsu the fresh water and Tiamat the salt mingle and produce the gods, and argued that Homer’s primal couple is that couple, borrowed. Some who follow the argument go further and read the name Tethys itself as a Greek reshaping of Akkadian tiamtu, the sea. This is modern scholarship rather than ancient testimony, and worth naming as such. What is not in dispute is that the Greek tradition preserved a version in which everything begins in water and nobody quite remembered why.

Hera knew her well. When Zeus drove Cronus down beneath the earth and the barren sea, Rhea handed her daughter to Oceanus and Tethys, and Tethys raised her in their own house. Hera says so twice in the fourteenth book of the Iliad, and both times she is lying about where she is going. Her stated errand is marriage counselling: the old couple have not shared a bed in a long while, rancour has got into them, and she means to reconcile them. Her actual errand is to seduce her husband on the slopes of Mount Ida so that Poseidon can help the Greeks unobserved. The foster mother is a cover story, which tells you something about how far the world’s edge felt from Troy.

The debt was called in later. When Zeus set Callisto in the sky as the Great Bear, Hera went down to the sea, to Tethys and old Oceanus, and asked one thing: keep that star out of your water. Ovid has her arrive furious and phrase it as a favour owed to the woman who reared her. Hyginus gives the same reason twice over, that Tethys was the nurse of Juno and will not receive her husband’s mistress among the setting stars. The sea gods assented. And that, the story says, is why the Bear wheels round the pole all night and never once goes under the horizon to bathe. A goddess whose single most consequential act on record is refusing a constellation a wash.

She kept the gate at the other end of the sky too. In Ovid, the horses of the Sun kick and snort fire behind the bars until Tethys draws them back and the day is loosed across the heavens, and in the evening she stands below with her arms raised while the chariot comes down hissing into the water. After Phaethon lost control of it, she was the one scrabbling in the shallows for fragments of yoke and axle.

Nobody in the archaic period bothers to say what she looked like. On a black-figure dinos in the British Museum she walks in procession beside Eileithyia and her fish-tailed husband, an unremarkable woman in an unremarkable robe, identifiable only because someone painted her name. The Romans finally gave her a face. In the mosaics of Antioch she becomes a broad-featured matron rising out of dark water with a small pair of feathered wings springing from her temples, probably because she mothers the rain clouds. The great example, nearly twenty-one feet across, was lifted from the floor of an Antioch bath house in 1938 and now sits in a building at Harvard: mid-fourth century, multicoloured stone and glass, a rudder propped against her shoulder, twenty-three sea creatures circling her head, bass and sea bream and squid and dolphins whose glass scales were meant to be seen through moving water. It was laid at the bottom of a pool. The tesserae were designed to be looked at while wet.

Her powers follow from what she is. She holds the world’s fresh water and can withhold it, admit or refuse a star, open or close the sun’s stable, purify a man in a hundred rivers at once, as she and Oceanus did for Glaucus with a ninefold chant that scoured the mortality out of him. Her mercy operates on the same principle and is not always kind. When the Trojan prince Aesacus threw himself into the sea after the death of Hesperie, Tethys caught him as he fell and clothed him in feathers, so that he struck the water as a bird and survived. He tried again. She would not let him drown. He is still down there, diving.

The limits are the other side of the same coin. She fights nobody. She appears in no battle line, takes no part in the war against the Titans, and holds no sanctuary, no priesthood, no festival anywhere in Greece. Everything she does, she does because someone comes to the edge of the world and asks. Late poets stopped distinguishing her from the sea itself and used her name interchangeably with Thalassa and Amphitrite, which flattened the one thing that made her specific: she was never the salt water. And her name sits a single vowel away from Thetis, mother of Achilles, a wholly different goddess. The two have been confused since antiquity, and the older, larger, quieter one usually loses.

Frequently Asked Questions

Who is Tethys in Greek mythology?

Tethys is a Titaness, one of the children of Gaia and Uranus, and the goddess of the fresh water that feeds the earth. She married her brother Oceanus, the river that encircles the world, and with him produced the rivers and the water nymphs. She also raised Hera after Zeus overthrew Cronus.

What is Tethys the goddess of?

Tethys governs fresh water rather than the sea. She was understood to draw the water of Oceanus through caverns beneath the earth and release it into springs, rivers and rain clouds, which is why later poets call her the source of pure fountains and the mother of clouds. Salt water belonged to other deities.

How many children did Tethys have?

Hesiod credits Tethys and Oceanus with three thousand rivers and three thousand daughters, the Oceanids, though he names only about twenty-five of each. The named daughters include Styx, Metis, Eurynome, Doris and Calypso, which places Tethys at the root of a large part of Greek genealogy.

Why does the Great Bear never set?

Because Tethys refused to let it into her water. After Hera complained that her husband’s mistress Callisto had been placed in the sky as a constellation, she asked her foster mother to bar that star from the sea, and Tethys agreed. The story explains why the Great Bear circles the pole without ever dipping below the horizon.

What is the difference between Tethys and Thetis?

They are two different goddesses whose names differ by one vowel. Tethys is an elder Titaness, wife of Oceanus and goddess of fresh water. Thetis is a much younger sea nymph, one of the Nereids, and the mother of Achilles.