Khalkotauroi
In the Argonautica, Jason is promised the prized fleece by King Aeetes if he can first yoke the Khalkotauroi and use them to plough a field.[1] Jason survives the burning flames of the bronze bulls by rubbing on his body a magical potion that protects him from the heat.The potion has been provided by Medea, King Aeetes' own daughter, who has fallen in love with Jason.[1] The Khalkotauroi were a gift to King Aeetes from the Greek gods' blacksmith, Hephaestus.[2] He Hephaistos had also made for him Aeetes king of Kolkhis Bulls with feet of bronze the Khalkotauroi and bronze mouths from which the breath came out in flame, blazing and terrible.