Celaeno is one of the villains of the book and 1982 fantasy movie, The Last Unicorn. She was played by Keenan Wynn.
A truly real creature and immortal like the heroine, The Unicorn/Lady Amalthea, who was seized and captured by Mommy Fortuna asleep. Schmendrick, hero and magician, points out to The Unicorn of the risks of keeping a creature like Celaeno confined. Celaeno watches The Unicorn and other characters and tries to get out of her prison but Mommy Fortuna manages to ensure her jail by using her magic.
Then afterward, Mommy Fortuna talks and hangs out with The Unicorn and lets her know that Celaeno was just as simple to steal like The Unicorn. She also mentions that Celaeno will destroy her sooner or later but says her so-called immortality is is that Celaeno will always know that Mommy Fortuna caught and imprisoned her. The Unicorn says to her to let her go although Mommy Fortuna ignores her. Then later as The Unicorn and Schmendrick free the animals from their prison, Celaeno says to The Unicorn to set her free set her free we are sisters you and I and sure enough The Unicron does so and Celaeno freed attempts to kill The Unicorn but fails.
Then Mommy Fortuna laughs and says "not alone, I helped you!" and then Celaeno strikes and destroys Mommy Fortuna. Celaeno kills Rukh soon after and The Unicorn warns Schmendrick not to run because running attracts attention and Celaeno flys away. Later The Unicorn/Lady Amalthea dreams about Celaeno.
- Celaeno (/sᵻˈliːnoʊ/; Ancient Greek: Κελαινώ Kelaino, lit. 'the dark one', also Celeno or Kelaino, sometimes [misspelled] Calaeno) referred to several different figures in Greek mythology.
- Celaeno, one of the Harpies, whom Aeneas encountered at Strophades. She gave him prophecies of his coming journeys.
((Celaeno, one of the Pleiades. She was said to be mother of Lycus and Nycteus by Poseidon; of Eurypylus (or Eurytus), King of Cyrene, and Lycaon, also by Poseidon; and of Lycus and Chimaereus by Prometheus.
- Celaeno, one of the Danaids, the daughters of Danaus. Her mother was Crino. She married and killed Hyperbius, son of Aegyptus and Hephaestine. She was also believed to have had a son Celaenus by Poseidon.
- Celaeno, an Amazon who was killed by Heracles whilst he was undertaking the 9th labour.
- Celaeno, daughter of Hyamus and granddaughter of Lycorus. She was the mother of Delphus by Apollo.
- The following modern uses derive from the Ancient Greek mythical name:
- Celaeno, a star in the Pleiades open cluster of stars.
- USS Celeno (AK-76), a United States Navy Crater class cargo ship.