Vulcan

Vulcan in Roman Mythology is the son of Jupiter and Juno, and husband of Maia? and Venus. He was god of fire and volcanoes, and the manufacturer of art, arms and armor for gods and heroes. His smithy was believed to be situated underneath [Mount Aetna]? in Sicily. At the Vulcanalia festival, which was held on August 23, fish and small animals were thrown into a fire.

Vulcan's analogue in Greek mythology is the god Hephaestus?.

At one point it was suspected that there existed a small planet that orbited between Mercury and the Sun, proposed to explain perturbations in Mercury's orbit from the path predicted by Classical Mechanics. This hypothetical planet was known as Vulcan. Albert Einstein's Theory of Relativity later explained these perturbations without the need for a third body, however, and so the possible existence of the planet Vulcan was discounted.