In Greek mythology, two monsters that guarded the narrow passage through which Odysseus had to sail in his wanderings. These waters are now identified with the Strait of Messina. On one shore was Scylla, a monster with six snaky heads, who reached out of her cave to seize and devour six of Odysseus' companions. On the opposite shore was Charybdis, the personification of a whirlpool, who drank down and belched forth the waters three times a day. The shipwrecked Odysseus saved himself by clinging to a tree on the shore until his raft floated to the surface.
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Scylla (Σκύλλα, Skulla), also known as Scylle (Σκύλλη, Skullē), was one of the two monsters in Greek mythology (the other being Charybdis) that lived on either side of a narrow channel of water. The two sides of the strait were within an arrow's range of each other—so close that sailors attempting to avoid Charybdis would pass too close to Scylla and vice versa. The phrase "between Scylla and Charybdis" has come to mean being in a state where one is between two dangers and moving away from one will cause you to be in danger from the other. Traditionally the aforementioned strait has been associated with the Strait of Messina between Italy and Sicily, but more recently this theory has been challenged, and the alternative location of Cape Skilla in northwest Greece has been suggested by Tim Severin.
Scylla was a horribly grotesque sea monster, with six long necks equipped with grisly heads, each of which contained three rows of sharp teeth. Her body consisted of twelve canine legs and a cat's tail. She was one of the children of Phorcys and either Hecate, Crataeis, Lamia or Ceto (where Scylla would also be known as one of the Phorcydes). Some sources, including Stesichorus cite her parents as Triton and Lamia.
In classical art, she was depicted as a fish-tailed mermaid with four to six dog-heads ringing her waist.
It is said that by the time Aeneas' fleet came through the strait after the fall of Troy, Scylla had been changed into a dangerous rock outcropping which still stands there to this day.
The character of Sin from John Milton's Paradise Lost is similar to Scylla. Scylla and Charybdis are actually mentioned at one point in the poem.