Belanus, the one associated with fire. Beltine, fire of Bel.
Another choice would be Zeus since the games were dedicated to him. Plus the statue they used at the games was made of gold and ivory and is one of the 7 wonders of the ancient world.Belenus was a more local god, name means the "shining one" and he is considered a solar god. Gold is the metal for solar gods.Midas made me think of Goldfinger - Nah!