One of the Pleiades
Celaeno (Greek Kelaino, “the dark one” or “the swarthy”) was one of the seven Pleiades, the star-nymphs of Greek myth who were set among the heavens as the celebrated cluster that still bears their name. Her sisters were Maia, Electra, Alcyone, Taygete, Sterope, and Merope. Together these seven formed one of the most recognisable groups in the ancient sky, and each was remembered both as a nymph of the mythic world and as a glimmering point of light within the same small patch of stars.
Celaeno’s name, connected to the Greek word for “black” or “dark,” set her apart among her more luminous sisters. It is a fitting epithet for a figure whose star is one of the dimmer members of the cluster, and later star-lore sometimes drew a link between her shadowy name and the tradition of a faint or “lost” Pleiad.
Daughter of Atlas and Pleione
Like all the Pleiades, Celaeno was a daughter of the Titan Atlas, who bore the weight of the heavens upon his shoulders, and the Oceanid Pleione, a sea-nymph daughter of Oceanus. From Pleione the sisters took their collective name, and through Atlas they belonged to the older generation of Titan-descended divinities. Their half-sisters included the Hyades and, in some traditions, the nymph Calypso, so that Celaeno stood within a wide family of sky- and sea-associated nymphs.
This dual heritage—heaven-bearing Titan and daughter of the sea—suited a nymph who would herself become both a bride of the ocean and a fixture of the night sky.
Consort of Poseidon
Celaeno is best known through her union with Poseidon, the god of the sea. The clearest tradition names their son Lycus, whom Poseidon is said to have settled among the blessed in the Islands of the Blest, together with Eurypylus, a king linked to the founding line of Cyrene in North Africa. Through these children the star-nymph was drawn into the seed of Poseidon and bound to royal houses of the mortal world.
Other authors extend her family further. The mythographer Hyginus counts Lycus and Nycteus among her sons by Poseidon, tying her to the tangled saga of Thebes—for a Nycteus and a Lycus of that city were long remembered as brothers, the one the father of Antiope, the other a powerful and often tyrannical regent of Thebes. Elsewhere those Theban brothers are given a quite different parentage, and later writers add still other names, such as a son called Lycaon, so that the details shift from source to source. What stays constant is that Celaeno’s line was reckoned among the offspring of Poseidon.
Among the Stars
The enduring fame of Celaeno and her sisters rests on their transformation into the Pleiades cluster, placed in the sky where they could be seen wheeling through the seasons. To the farmers and sailors of the ancient Mediterranean, the Pleiades were far more than a pretty grouping: their heliacal rising in spring and their setting in autumn served as a natural calendar. The appearance of the cluster signalled the season for sowing and the opening of safe sailing, while its disappearance warned of harvest’s end and the coming of storms that closed the seas.
Within this cluster the star named Celaeno is among the fainter lights, harder to pick out than brilliant Alcyone or Electra. The ancients noticed that only six stars shone clearly to most eyes, and legends of a “lost Pleiad” grew up to explain the missing seventh. That vanished sister was most often said to be Merope or Electra, yet because of Celaeno’s dark name and dim star—and a tradition that she had been struck by a thunderbolt—she too was sometimes counted among those said to have grown faint or hidden themselves away.
Not to Be Confused with the Harpy
A word of caution is needed, for Greek myth knows a second Celaeno entirely distinct from the Pleiad. That other Celaeno was one of the Harpies, the winged storm-spirits who snatch and defile, remembered among those that tormented the blind prophet Phineus and, in later tradition, for hurling a dark prophecy at the Trojans in Virgil’s Aeneid. Though the two share a name that means “the dark one,” they are separate figures with separate parentage and roles. This article concerns the gentler Celaeno—daughter of Atlas, bride of Poseidon, and one of the seven shining Pleiades of the night sky.