From A Wiki of Ice and Fire
“Once there were two moons in the sky, but one wandered too close to the sun and cracked from the heat. A thousand thousand dragons poured forth, and drank the fire from the sun. That is why dragons breathe flame. One day the other moon will kiss the sun too, and then it will crack and the dragons will return.” —Doreah to Daenerys Targaryen
- ↑ A Game of Thrones, Chapter 23, Daenerys III.