The Crommyonian Sow was a huge pig in Greek mythology. It was the daughter of the monsters Typhon and Echidna, and according to some sources, it gave birth to another monster, the Calydonian Boar. The Crommyonian Sow destroyed the lands around Crommyon, a village between Megara and Corinth, but was killed by the mythical hero Theseus.
See Also: Typhon, Echidna, Calydonian Boar, Theseus