In Greek mythology, Scylla was a monster that lived on one side of a narrow channel of water, opposite its counterpart Charybdis. 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.
Scylla was a horrible sea monster with six long necks equipped with grisly heads, each of which contained three rows of sharp teeth.Her body consisted of twelve tentacle-like legs and a cat's tail and with four to six dog-heads ringing her waist. She was one of the children of Phorcys and either Hecate, Crataeis, Lamia or Ceto . Some sources, including Stesichorus cite her parents as Triton and Lamia.
Traditionally the 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 Scilla in northwest Greece has been suggested by Tim Severin.
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.
In Homer's Odyssey XII, Odysseus is given advice by Circe to sail closer to Scylla, for Charybdis could drown his whole ship: "Hug Scylla's crag—sail on past her—top speed! Better by far to lose six men and keep your ship than lose your entire crew" she warns and tells Odysseus to bid Crataeis prevent her from pouncing more than once. Odysseus then successfully sails his ship past Scylla and Charybdis, but Scylla manages to catch six of his men, devouring them alive: