THE DRAKON KHOLKIKOS (Colchian Dragon) was a giant, watchful serpent which guarded the Golden Fleece in the sacred grove of Ares in Kolkhis (Colchis).
When Jason and the Argonauts came to fetch the fleece, the beast was either slain by the hero or put to sleep by the witch Medea.
In one version of the story--preserved only in vase painting (see image right)--Jason was first devoured and disgorged by the dragon.
The monster's teeth were harvested by King Aeetes for their magikal properties.
He commanded Jason sow them in a sacred field of Ares with a plough drawn by fire-breathing bulls.
When they were seeded a tribe of warlike men (Spartoi) sprang up full-grown from the earth.
The teeth of the closely related Ismenian Drakon of Thebes, sown by Kadmos (Cadmus), produced a similar crop of men.
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Source & Image - http://www.theoi.com/Ther/DrakonKholkikos.html