In a place north of Isthmus, called Crommyon, Theseus killed an enormous pig, the Crommyonian sow.

The Crommyonian sow, which they called Phaea, was a savage and formidable wild beast, by no means an enemy to be despised. Theseus killed her, going out of his way on purpose to meet and engage her, so that he might not seem to perform all his great exploits out of mere necessity ; being also of opinion that it was the part of a brave man to chastise villainous and wicked men when attacked by them, but to seek out and overcome the more noble wild beasts. Others relate that Phaea was a woman, a robber full of cruelty and lust, that lived in Crommyon, and had the name of Sow given her from the foulness of her life and manners, and afterwards was killed by Theseus, Plutarch Theseus

Theseus and the Crommyonian Sow