From A Wiki of Ice and Fire
The one-eyed crone is an ancient crone of the dosh khaleen who dwell in Vaes Dothrak. She is a bent and shrivelled stick of a woman with a single back eye. She is the oldest of the crones and has a thin wavery voice. It is she who makes the prophecy that Daenerys and Drogo’s unborn son is the stallion who mounts the world.
A Game of Thrones
At Vaes Dothrak, right after Daenerys Targaryen costumes the stallion heart, she and her husband turn to the dosh khaleen to hear their son’s destiny foretold. The one-eyed crone closes her single eye so that she can peer more easily into the future. When she finally opens her eye she lifts her arms and proclaims the prophecy.
Afterwards she then peers at Dany and asks her the name of the stallion that mounts the world, Dany replies that he shall be called Rhaego.
|“||The old woman trembled and looked at Dany almost as if she were afraid. ||”|