The Cetus was created by Poseidon, god of the sea.
It was amphibious and could survive on land or water.
This ferocious water monster had canine-like front legs, a bloated torso like that of a whale and a serpentine tail that was split at the end.
Poseidon used this beast to destroy the city of Joppa after hearing that Queen Cassiopeia was boasting that her daughter Andromeda was more beautiful than any goddess on land or in the sea.
This vicious mythical creature was finally stopped in its tracks
by Perseus and his steed, the winged horse
Pegasus
. While returning from his victorious battle with
Medusa
, he came across Andromeda chained to a rock awaiting her fate as a meal to the dreadful sea monstrosity.
When the enormous serpent rose from the waters to take its sacrifice, Perseus held up his newly acquired trophy (the severed head of Medusa) straight to its eyes.
The dragon immediately turned to stone and crumbled into a million pieces back into the waters.