Peter Paul Rubens, Vulcan Forging the Lightning of Jupiter, c. 1636-1637, oil on canvas, 181 x 97 cm, Museo del Prado, Madrid
Hephaestus (Greek) or Vulcan (Roman) is the god of fire, and the blacksmith the the gods. He is the son of Zeus/Jupiter and Hera/Juno, but as a child was thrown by either his mother or father from Olympus, leaving him with a deformed foot. He married Aphrodite/Venus, but caught her with Ares/Mars in their wedding bed.
He is frequently depicted at his forge, sometimes with Venus or his Cyclops assistants. Another popular scene involves him discovering Aphrodite/Venus and Ares/Mars.