The Bronze Bulls

The Bronze Bulls, or the Colchis Bulls (kol-kis buls), were two Automaton bulls.

Mythology
The Bronze Bulls were a pair of metal, fire-breathing Automatons that were made by Hephaestus as a gift for King Aeetes of Colchis. When Jason came to retreive the Golden Fleece, Aeetes had him use the bulls to sow the teeth of a dragon into the ground.