Vulcan (mythology)
Vulcan's oldest shrine in Rome, called the "Volcanal", was in the Roman Forum.  It was said to have been built during the Roman Kingdom by Titus Tatius, the Sabine co-king, in the eighth century BC.  The Etruscan haruspices thought a temple of Vulcan should be outside the city, and the Volcanal may originally have been on or outside the city limits before they expanded to include the Capitoline Hill.  Vulcan also had a temple on the Campus Marius.