Lady Snow- a game of thrones fanfiction
'Burn them all'
Helaena Snow, Jon's twin, even has a song sung about her which in her opinion is horrible, but she can also see things- not the past or future but the present.
Very few people know about her true parentage, Eddard stark and Howland reed. But varys, the master of whisperers figured it out and he told magister Illyrio who sent her and Jon a quite large dragon egg. In the fire of the library Helaena is caught but from the smoke and flames comes a dragon, Helaena is the mother of a dragon before daenerys. After hatching they are the size of a large cat but a dragon grows fast, just like a targaryens lust for power.