Hephaestus is the god of fire, the forge, blacksmiths, and craftsmen. Axes, mules, blacksmiths, and workmans' caps symbolize Hephaestus. He made many famous Greek metalworks including the shield of Achilles. He makes an appearance in both The Iliad and The Odyssey.
Hephaestus is the son of Hera. Zeus had angered Hera by having Athena without her, so she tried to do the same. However, the result wasn't pretty; Hephaestus was deformed from birth causing Hera to throw him from Olympus. He fell to the island Lemnos where he was raised.
Rise to Olympus
When Hephaestus was older he became bitter about what his mother had done, so he built her a throne as a gift using his skills as a smithy. The chair was actually a trap that captured Hera when she sat in it. Zeus made Hephaestus one of the twelve Olympians and gave him Aphrodite as a wife to pay ransom for Hera's release.