A Titan, Theia was married to her brother Hyperion, by whom she gave birth to three gods: Helios (the sun), Eos (the dawn), and Selene (the moon). She was the goddess of sight. Since the ancient Greeks believed that sight was a beam emitted by the eyes in a manner similar to the sun’s rays or the moon’s rays, she was thought to endow gold, silver, and gems with their luster and beauty. Her children were all associated with light.