It is the popular belief that "A Song of Ice and Fire" pertains to Jon Snow, because he is a product of a Stark (Ice) and a Targaryen (Fire). But how can we be sure that the title implies that Jon Snow is Azor Ahai or the main protagonist of the story? When you think of it, it could be that the title pertains on how Jon Snow will be the biggest villain in the end of the story; kind of how "Lord of the Rings" pertains to Sauron.
Ice dragons are pretty much hyped in the books and the TV series, because the army of the dead will not stand a chance against Dany's fire dragons. Who is the best candidate to control an ice dragon than Jon, who has dragon's blood and a certain affinity to the cold?
